IONICS INC
10-K, 1994-03-29
SPECIAL INDUSTRY MACHINERY, NEC
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                                   FORM 10-K

                      SECURITIES AND EXCHANGE COMMISSION

                             Washington, DC 20549


[ X ]  ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
        SECURITIES EXCHANGE ACT OF 1934 [FEE REQUIRED]

For the fiscal year ended   December 31, 1993                               

                                      OR

[   ]  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
        SECURITIES EXCHANGE ACT OF 1934 [NO FEE REQUIRED]

For the transition period ended ___________________________________________

Commission File Number          1-7211                                     

                            Ionics, Incorporated                    
             (Exact name of registrant as specified in it charter)

              Massachusetts                                04-2068530       
       State or other jurisdiction of                   (I.R.S. Employer 
       incorporation or organization                 Identification Number)

 65 Grove Street, Watertown, Massachusetts                   02172          
(Address of principal executive offices)                   (Zip Code)

Registrant's telephone number, including area code:       617-926-2500      


Securities registered pursuant to Section 12(b) of the Act:

   Title of each class            Name of each exchange on which registered

Common Stock, $1 par value                 New York Stock Exchange          


          Securities registered pursuant to Section 12(g) of the Act:

                                     None                                
                               (Title of Class)

Indicate by check mark whether the registrant (1) has filed all reports 
required to be filed by Section 13 or 15(d) of the Securities Exchange Act 
of 1934 during the preceding 12 months (or for such shorter period that the 
registrant was required to file such reports), and (2) has been subject to 
such filing requirements for the past 90 days.  YES   X       NO       

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405
of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to 
this Form 10-K.      [  ]
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<PAGE>




State the aggregate market value of the voting stock held by non-affiliates of
the registrant.  The aggregate market value shall be computed by reference to
the price at which the stock was sold, or the average bid and asked prices of
such stock, as of a specified date within 60 days prior to the date of filing.
The aggregate market value of the voting stock held by non-affiliates as of
March 18, 1994 was $320,445,029 (6,658,598 shares at $48 1/8 per share)
(includes shares owned by a trust for the indirect benefit of a non-employee
director, and by a trust for the indirect benefit of a spouse of a non-employee
director).


                  (APPLICABLE ONLY TO CORPORATE REGISTRANTS)

     Indicate the number of shares outstanding of each of the registrant's
classes of common stock, as of the latest practicable date.  As of March 18,
1994, 6,949,406 shares of Common Stock, $1 par value, were issued and
outstanding.


                      DOCUMENTS INCORPORATED BY REFERENCE

Portions of 1993 Annual Report to Stockholders              Parts I, II and IV

Portions of Definitive Proxy Statement for 
the Annual Meeting of Stockholders to be held 
on May 5, 1994                                              Part III


































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                                  PART I

Item 1.  BUSINESS

     Ionics, Incorporated ("Ionics," the "Company," or the "Registrant") is
a leading water purification company engaged worldwide in the supply of
water and of water treatment equipment through the use of proprietary
separations technologies and systems.  Ionics' products and services are
used by the Company or its customers to desalt brackish water and seawater,
to purify and supply bottled water, to treat water in the home, to
manufacture and supply water treatment chemicals and ultrapure water, to
recycle and reclaim process water and wastewater, and to measure levels of
water-borne contaminants and pollutants.  The Company's customers include
industrial companies, consumers, municipalities and utilities.

     The Company's business activities are divided into three segments:
membranes and related equipment, water and chemical supply, and consumer
water products, which in 1993 accounted for approximately 53%, 29% and 18%
of revenues, respectively.  Since 1985, the Company has pursued a strategy
of expanding beyond its traditional focus of selling desalination plants
and equipment by owning and operating its own equipment to produce and sell
water and chemicals.  Approximately 45% of the Company's 1993 revenues were
derived from foreign sales or operations.

     Over forty years ago, the Company pioneered the development of the
ion-exchange membrane and the electrodialysis process.  Since that time,
the Company has expanded its separations technology base to include the
electrodialysis reversal (EDR), reverse osmosis (RO), ultrafiltration (UF)
and microfiltration (MF) membrane processes, as well as related processes
such as electrodeionization (EDI), ion exchange and carbon adsorption.
With its acquisition of the business of Resources Conservation Company
(RCC) at the end of 1993, the Company's separations technology base now
includes thermal processes such as evaporation and crystallization.  The
Company believes that it is the world's leading manufacturer of ion-
exchange membranes and of membrane-based systems for the desalination of
water.  

     The Company was incorporated in Massachusetts in 1948.  The Company's
principal executive offices are located at 65 Grove Street, Watertown,
Massachusetts 02172.


Financial Information About Business Segments

     The information contained in Note 14 of Notes to Consolidated
Financial Statements contained in the Company's Annual Report to
Stockholders for the year ended December 31, 1993 is incorporated herein by
reference.


Membranes and Related Equipment

     The Company's membranes and related equipment business segment, which 



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accounted for approximately 53% of revenues in 1993, currently encompasses
the following products:  electrodialysis reversal systems; reverse osmosis
systems; microfiltration systems; non-membrane water and wastewater
treatment equipment; other separations technology products; instruments for
monitoring and on-line detection of pollution levels; fabricated products;
and brine concentrators, evaporators and crystallizers utilizing thermal
separations processes.

     EDR Systems

     The Company's AquamiteR desalination systems utilize Ionics' EDR
process to treat brackish water and produce potable water for commercial,
municipal, and a variety of industrial purposes.  

     The Company has built and installed approximately 2,000 systems and
plants utilizing its ED and EDR technology.  Today, the Company sells,
under the Aquamite name, a number of standardized versions of EDR
equipment, which are designed for ease of installation and low maintenance
and have production capacities ranging from 500 gallons to 1.5 million
gallons per day.  Multiple unit configurations are used for systems of
larger capacities. 

     Customers for water purification systems increasingly have requested
the Company to supply complete turnkey plants.  For such customers, Ionics
provides basic Aquamite equipment, peripheral water treatment equipment,
complete engineering services, process and equipment design, project
engineering, commissioning, operator training and field service.


     RO Systems

     The Company manufactures seawater desalination plants as well as
systems for the production of ultrapure water which utilize RO membrane
technology.  The Company owns and operates seawater desalination plants in
Grand Canary, Spain, Santa Barbara, California, and at the Diablo Canyon
Power Plant in California.  See "Water and Chemical Supply."


     MF Systems

     Utilizing the Company's proprietary Aqua-PoreR microfiltration
membranes, the Company's EnviromatR Integrated Membrane Filtration System
removes toxic contaminants such as lead, nickel and other materials from
industrial wastewaters and enables manufacturers to meet stringent
regulations for effluent compliance.


     Non-Membrane Water and Wastewater Treatment Equipment

     Through its wholly owned Italian subsidiary, Ionics Italba, S.p.A.,
Ionics designs, engineers and constructs customized systems for wastewater
and municipal water treatment.  These include ion-exchange systems which
provide purified water for power stations, chemical and petrochemical
plants, metalworking and automobile factories, textile manufacture and a
variety of other industrial applications.  Other systems neutralize and 


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                                      I-2
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filter industrial wastewater, separate suspended solids and, in some cases,
recover chemicals.  Ionics Italba also provides custom municipal and
packaged sewage treatment systems.  Ionics Italba generally subcontracts
the construction activities associated with its projects.

     Through its Resources Conservation Company (RCC) business unit, Ionics
designs, engineers and constructs brine concentrators, evaporators and
crystallizers which are used to clean, recover and recycle wastewater,
particularly in zero liquid discharge industrial uses.  RCC also developed,
and holds an exclusive license for, a patented solvent extraction
technology known as B.E.S.T. (Basic Extractive Sludge Technology), which
separates contaminated sludges, sediments and soils into oil, water and
solids, and has potential use for the cleanup of toxic organic materials at
Superfund Sites.

     Other Separations Technology Products

     Using its separations technology, Ionics manufactures, markets or
supplies products which are used in the recovery and recycling of selected
components from process streams, the manufacture of commodity and specialty
compounds and the purification of valuable fluids.  The Company's
ElectromatR system is used in the demineralization of cheese whey to
produce a major component utilized extensively in infant formula products.
A similar Ionics system is used to deacidify fruit juices for a
manufacturer of canned fruit products.  The Company's food product revenues
have been derived from three sources:  the design and construction of the
system, the manufacture and sale of replacement membranes used in the
system, and in certain applications a royalty (based on Ionics' U.S.
patents) on the throughput of product.  

     At the end of 1993, the Company obtained an additional source of food
produce revenues by entering into an agreement with a major U.S. dairy
cooperative to oversee whey processing activities at plants owned by the
cooperative, for which the Company will receive a processing fee based on
the production of demineralized whey.  

     Other Ionics process systems include the ChemomatR system to generate
organic acids and to recover, recycle, remove and separate metals and other
components from industrial wastewaters, and the CloromatR system for the
production of sodium hypochlorite and related chlor-alkali chemicals.


     Instruments for Monitoring and On-Line Detection of Pollution Levels

     The Company designs, manufactures and sells equipment to measure the
quality of treated or untreated water.  Its products, which are used by
industrial and governmental customers to measure organic and toxic
contaminants in water and chemical process streams, include process and
laboratory instruments to measure total carbon, total organic carbon,
chemical oxygen demand and total oxygen demand.  The Company recently
expanded the monitoring capabilities of its instruments with the
introduction of analyzers to measure concentrations at the parts per
billion level of dissolved metals such as copper, lead, iron, mercury, and
arsenic and specific chemical analyzers for ammonia, phosphates, nitrates, 




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and chlorine.  The process systems provide real-time measurement of the
level of contaminants in active waste streams.  Another product, the
DigichemR, sold principally to the printed circuit board, pulp and paper,
and chemical and petrochemical industries, functions as a "robot chemist"
capable of performing automatically "wet chemistry" analyses traditionally
done manually.


     Fabricated Products

     At its Bridgeville, Pennsylvania facility, the Company fabricates
specially designed products for defense-related and industrial
applications.  The Company's experience and expertise in design, welding,
machining and assembly to meet exceptionally fine tolerances have been
utilized to fabricate products ranging from intricate small parts to very
large 35-ton assemblies.


Water and Chemical Supply

     The water and chemical supply business segment accounted in 1993 for
approximately 29% of the Company's revenues.  The Company's strategy is to
sell, where appropriate, water and chemicals produced by its membrane-based
equipment, rather than selling the equipment itself.  The water and
chemical supply business segment can be divided into three categories:
sale of desalted water for municipal and industrial use; sale of ultrapure
water for electronics and other industries; and sale of bleach and related
chemicals. 


     Sale of Desalted Water for Municipal and Industrial Use  

     Ionics' position in water supply as a seller of purified or treated
water has evolved from its traditional role as a supplier of water
treatment equipment.  In certain situations, opportunities are available
for the Company to provide a complete service package involving financing,
construction, operation and maintenance of water treatment facilities.

     Ionics, through its wholly owned subsidiary, Ionics Iberica, S.A.,
owns and operates a 5.5 million gallon per day capacity brackish water EDR
facility and a 2.0 million gallon per day RO seawater facility on Grand
Canary Island, Spain.  Under long-term contracts, the Company is selling
the desalted water from both facilities to the local water utility for
distribution.

     The Company's wholly owned subsidiary, Ionics (Bermuda) Ltd., operates
a 600,000 gallon per day EDR brackish water desalting plant on the island
of Bermuda.  This plant supplies fresh water under a long-term contract
with Watlington Waterworks Ltd., a Bermuda corporation partially owned by
Ionics.








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                                      I-4
<PAGE>



     The Company  financed and constructed, and owns and operates, an RO
desalination facility in Santa Barbara, California.  The facility began
operation in March 1992, has the capacity to produce 7,500 acre-feet per
year (approximately 6.7 million gallons per day) of desalinated water, and
is expandable to 10,000 acre-feet per year.  Under the terms of the
Company's contract with the City, the City can either purchase water from
the Company or, under conditions in which the City deems it unnecessary to
purchase water, pay the Company a "stand-by fee" during the contract's
five-year term and, if the City elects to continue, a five-year extension
term.  The City has placed the facility on "stand-by" status because of the
alleviation of the area's drought.  At the end of the initial five-year
term, the City will have the right to renew the contract for another five-
year term, purchase the facility from the Company, or direct the Company to
remove the facility (most of which is housed in trailers) from its site.
In the event the City purchases the facility, the City must reimburse the
Company for all costs not previously recovered from operations, plus a
factor to cover general and administrative expenses and profit.


     Sale of Ultrapure Water for Electronics and Other Industries  

     In industries from biotechnology and chemical processing to
pharmaceuticals and semiconductors, ultrapure water (water in which the
impurities have been reduced to concentrations of less than several parts
per billion) is critical to product quality and yield.  In the electric
power industry, ultrapure boiler feedwater minimizes corrosion,
inefficiency and downtime in steam boilers and turbines.  Depending on the
composition and quantity of the impurities to be removed or treated, any
one of several membrane separations methods can be utilized to provide
ultrapure water to the customer.  Ionics has pioneered in the application
of three membrane technologies (EDR, RO and UF) combined together in a
mobile system called the "triple membrane" trailer, which the Company
believes to be the most advanced technology used in the commercial
processing of ultrapure water.  Ionics provides ultrapure water services
through the sale of ultrapure water in 6,000 gallon tank trucks and the
production and sale of ultrapure water from trailer-mounted units at the
customer sites.

     In 1992, Ionics announced the commercial implementation of its new
electrodeionization (EDI) technology in the production of ultrapure water.
EDI is a continuous, electrically driven, membrane-based water purification
process which produces ultrapure water without the use of the strong
chemical regenerants, such as sulfuric acid and caustic soda, which are
commonly required.  In 1993, trailers utilizing EDI technology were in
service at sites in Florida, Arkansas and Mississippi.

     In March 1992, the Company began a ten-year, $20 million contract to
provide process water and ultrapure boiler feedwater to Pacific Gas and
Electric's Diablo Canyon Power Plant on the central coast of California.
In 1993, ten-year ultrapure water contracts were obtained from Florida
Power and Light for its Turkey Point fossil fuel power plant near Florida
City, and for the Seabrook Nuclear Station in Seabrook, New Hampshire.






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     The Company serves the ultrapure water market from its headquarters
facilities in Watertown, Massachusetts, through the Ionics Pure Solutions
Division in Phoenix, Arizona, and through the following subsidiaries:
Ionics Ultrapure Water Corporation, Campbell, California; Ionics (U.K.)
Limited, London, England; Ionics Italba, S.p.A., Milan, Italy; and Eau et
Industrie, Paris, France.


     Sale of Bleach and Related Chemicals

     In the chemical supply area, the Company uses its CloromatR technology
to produce sodium hypochlorite (household bleach) and related chlor-alkali
chemicals in a membrane-based process that principally relies on water and
salt as raw materials.  The Company's wholly owned Australian subsidiary,
Elite Chemicals Pty. Ltd., utilizes Cloromat systems to produce sodium
hypochlorite on-site in Brisbane, for sale to the bulk market.

     In 1993, the Company's wholly owned English subsidiary, Ionics (U.K.)
Limited, commenced bulk bleach sales at a new Cloromat facility in
Bridgwater, England.  A large portion of the facility's output is being
sold to Courtaulds Films (Holdings) Limited for use in cellophane
manufacture, and the balance is being sold to the regional market.

     In the United States, the Company's Elite Chemicals New England
division operates a Cloromat facility in Springfield, Massachusetts which
produces and distributes bleach-based products for the consumer market,
primarily one-gallon bleach products under private label or under the
Company's own "Elite" brand.  In September 1993, the Company contracted to
purchase a larger manufacturing facility, located in Ludlow, Massachusetts.
The Company intends to pursue a strategy of utilizing Cloromat equipment
and technology at Company-owned facilities to produce high quality bleach
and other chlor-alkali products at selected regional sites in the United
States and overseas.


Consumer Water Products

     Ionics' consumer water products business segment accounted for
approximately 18% of the Company's revenues in 1993.  The Company's
consumer water products include bottled water, over and under-the-sink
point-of-use devices, and point-of-entry systems for treating the entire
home water supply. 


     Aqua CoolR Pure Bottled Water

     Ionics entered the bottled water business in 1984.  The Company's
strategy is to utilize its proprietary desalination and purification
technology to create a brand of drinking water, named Aqua Cool Pure
Bottled Water, which can be reproduced with uniform consistency and high
quality at numerous locations around the world.  Distribution operations
have been established to serve the areas in and around London and
Manchester, England; Boston, Washington and Baltimore in the United States;
and, through joint ventures, in Bahrain, Kuwait and Saudi Arabia.  The
Company's business focuses on the sale of Aqua Cool in five-gallon bottles
to a variety of customers including banks, office buildings, commercial 

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establishments, hospitals and private homes.  The Company also manufactures
coolers in a wide variety of colors which offer options for hot, cold and
room temperature water.

     In 1989, the Company entered into agreements with Aqua Cool
Enterprises, Inc. (ACE), a newly formed, independently owned corporation,
which established ACE as a marketer and distributor of Aqua Cool in 10
eastern states and the District of Columbia, and provided for Ionics'
supply to ACE of products, management services and operational support.  In
May 1993, the Company loaned $8.25 million to ACE which was used by ACE to
redeem debt and preferred stock of ACE held by Westinghouse Credit
Corporation.  In June 1993, the Company's loan was converted into preferred
stock, and as a result of these transactions, the Company now consolidates
the operating results of ACE.

     ACE operates eight distribution centers in Massachusetts, Connecticut,
New York, New Jersey, Pennsylvania and Virginia, which augment the
Company's distribution network.  At the end of 1993, there were a total of
17 Aqua Cool distribution centers in the United States and overseas,
supplied with Aqua Cool by five regional water purification and bottling
facilities which are owned and operated by the Company.  Construction was
being completed of a new, larger bottling facility located outside
Washington, D.C., and plans were being prepared to construct a third U.S.
bottling facility in northern New Jersey.  In January 1994, the Company
announced plans to begin distribution of Aqua Cool in the Cincinnati, Ohio
area.

     Aqua Cool's focus has been in particular to obtain large commercial or
governmental supply contracts for five-gallon delivery, such as the
estimated $2 million, two-year contract awarded in 1993 by the City of New
York Department of General Services.

     Point-of-Use Devices  

     The Company participates in the "point-of-use" market for over and
under-the-sink water purifiers through the manufacture and sale of HYgeneR,
a proprietary, EPA-registered, silver-impregnated activated carbon
filtering media, and through the sale of reverse osmosis and activated
carbon-based filtering devices.  The Company incorporates HYgene, which is
designed to prevent bacterial build-up while providing the capability of
removing undesirable tastes and odors from the water supply, into its own
bacteriostatic water conditioners and also sells HYgene to manufacturers of
household point-of-use water filters.  In 1993, a substantial decline in
HYgene sales to other manufacturers continued as a result of lack of
business from the largest of the Company's HYgene customers.

     Point-of-Entry Systems  

     Ionics' point-of-entry water products include ion-exchange water
conditioners to "soften" hard water, and chemicals and media for filtration
and treatment.  The Company sells its products, under the General Ionics
brand, through both independent distributorships and wholly owned sales and
service dealerships.  For water conditioners sold by the latter, the
Company provides customer financing. 




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Raw Materials and Sources of Supply

     All raw materials essential to the business of the Company can
normally be obtained from more than one source.  In those few instances
where raw materials are being supplied by only one source, the current
supplier has given the Company a lead time for cancellation, which the
Company believes is sufficient to enable it to obtain other suppliers.  In
addition, the Company maintains inventories of single source items which it
believes are adequate under the circumstances.

     The Company produces the membranes required for its equipment and
systems that use the ED, EDR, MF, and EDI processes.  Membranes used for
the RO and UF processes are purchased from outside suppliers, and are
normally available from multiple sources.


Patents and Trademarks

     The Company believes that its products, know-how, servicing network
and marketing skills are more significant to its business than trademark or
patent protection of its technology.  Nevertheless, the Company has a
policy of applying for patents both in the United States and abroad on
inventions made in the course of its research and development work for
which a commercial use is considered likely.  The Company owns numerous
United States and foreign patents and trademarks and has issued licenses
thereunder, and currently has additional pending patent applications.  Of
the 107 active U.S. patents held by the Company, a substantial portion
involves membranes, membrane technology and related separations processes
such as electrodialysis and electrodialysis reversal, reverse osmosis,
ultrafiltration and electrodeionization.  The Company believes that none of
its individual patents or groups of related patents, nor any of its
trademarks, is of sufficient importance for its termination or abandonment,
or cancellation of licenses extending rights thereunder, to have a material
adverse effect on the Company.


Seasonality

     The activities of the Company's businesses are not of a seasonal
nature, except that bottled water sales and bleach products for swimming
pool use tend to increase during the summer months.  Also, the Company's
Elite Chemicals New England Facility produces windshield wash solution, for
which sales levels increase in the winter months.


Customers

     The nature of the Company's business is such that it frequently has in
progress large contracts with one or more customers for specific projects;
however, there is no one customer whose purchases account for 10% or more
of the Company's consolidated revenues and whose loss would have a material
adverse effect on the Company and its subsidiaries taken as a whole.






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Backlog

     The Company's backlog of firm orders was $129,271,000 at December 31,
1993 and $125,506,000 at December 31, 1992.  In the case of multi-year
contracts entered into through June 30, 1991, the Company initially
included in reported backlog only the revenues expected from the first four
years of the contract.  For multi-year contracts entered into after that
date, the Company has initially included in reported backlog the revenues
associated with the first five years of the contract.  Also, the Company
now includes in backlog up to one year of revenues relating to multi-year
contracts which are not otherwise included in backlog.  Ionics expects to
fill approximately 75% of its December 31, 1993 backlog during 1994.  The
Company does not believe that there are any seasonal aspects to these
backlog figures.


Government Contracts

     The Company does not believe that any of its sales under U.S.
Government contracts or subcontracts during 1993 are subject to
renegotiation.  The Company has not had adjustments to its negotiated
contract prices, nor are any proceedings pending for such adjustments.


Research and Development

     Since the development of the ion exchange membrane and the EDR
process, Ionics has continued its commitment to research and development
directed toward products for use in water purification, processing and
measurement, and separations technology.  The Company's research and
development expenses were approximately $3,678,000 in 1993, $3,084,000 in
1992, and $2,886,000 in 1991.


Competition

     The Company experiences competition from a variety of sources with
respect to virtually all of its products, systems and services, although
the Company knows of no single entity that competes with it across the full
range of its products and services.  Competition in the markets served by
the Company is based on a number of factors, which may include price,
technology, applications experience, know-how, availability of financing,
reputation, product warranties, reliability, service and distribution.

     With respect to the Company's membrane and related equipment business
segment, there are a number of companies, including several sizable
chemical companies, that manufacture membranes, but not equipment.  There
are numerous smaller companies, primarily fabricators, that build water
treatment and desalination equipment, but which generally do not have their
own proprietary membrane technology.  A limited number of companies
manufacture both membranes and equipment.  The Company has numerous
competitors in its conventional water treatment, instruments and fabricated
products business lines.





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     In 1992, the International Desalination Association released a report
providing data regarding the manufacturers of desalination equipment.
According to the report, which covered land-based water desalination plants
delivered or under construction as of December 1991, with a capacity to
produce 100 cubic meters (approximately 25,000 gallons) or more of fresh
water daily, Ionics ranked first in terms of the cumulative number of such
plants sold, having sold 1,127 plants of such capacity, more than the next
three manufacturers combined.  When compared only to manufacturers of
membrane-type desalination equipment, Ionics ranked first in both number of
units sold and the total capacity of units sold.

     With respect to the water and chemical supply business segment, the
Company competes with regional suppliers of ultrapure water services, and
with other manufacturers of membrane-related equipment.  In the chemical
supply activity, the Company competes with manufacturers and distributors
of bleach and water treatment chemicals.

     With respect to the Company's consumer water products business
segment, there are numerous bottled water companies which compete with the
Company, including several which are much larger than the Company.  Most of
the Company's competitors in point-of-entry and point-of-use products for
the home are small assemblers, serving local or regional markets.  However,
there are also several large companies competing nationally in these
markets.  In the case of its silver-impregnated activated carbon product
lines, the Company knows of two competitors with which it competes on a
national basis.

     The Company is unable to state with certainty its relative market
position in all aspects of its business.  Many of its competitors have
financial and other resources greater than those of the Company.


Environmental Matters

     Continued compliance by the Company or by its subsidiaries with
federal, state and local provisions regulating the discharge of materials
into the environment or otherwise relating to the protection of the
environment is expected to have no material effect upon capital
expenditures, earnings or the competitive position of the Company or any of
its subsidiaries.

     The Company is one of more than 200 potentially responsible parties
(PRPs) in connection with the Silresim Superfund Site in Lowell,
Massachusetts.  Under the Comprehensive Environmental Response Compensation
and Liability Act (CERCLA or Superfund), the U.S. Environmental Protection
Agency (EPA) has the authority to undertake remedial action at a Superfund
site and hold responsible parties liable, on a joint and several basis and
without regard to fault or negligence for costs incurred.  Under the terms
of a 1992 Settlement Agreement among the PRPs, EPA and the Commonwealth of
Massachusetts, Ionics paid $381,000 as a settlement amount to the site
settlement trust fund, representing the Company's approximately 1%
volumetric contribution of wastes to the site.  This fund will be used by 





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                                     I-10
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the EPA to clean up the Silresim Site.  The amount paid by Ionics had been
fully reserved at December 31, 1991, and the payment had no material
adverse impact on the Company.  Because the pollution problems at the site
have been extensively studied and because the funds collected from the
settling PRPs by the site settlement trust fund substantially exceeds the
EPA's own estimate of remediation costs, the Company believes that it is
highly unlikely that it will incur any further monetary obligations with
respect to this site, other than site access costs that will be incurred by
the EPA in connection with its remediation activities.  The Company's share
of these site access costs is expected to be $30,000 to $40,000 over the
next several years. 

     The Company was notified in June 1992 that it is a PRP at another
Superfund site, Solvent Recovery Service of New England, in Southington,
Connecticut (the "SRS Site").  The EPA has not yet completed its remedial
investigation or issued a record of decision specifying estimated clean-up
costs, and therefore it is too early to determine what the Company's
liability might be with respect to the SRS Site.  However, based upon the
very large number of PRPs identified with respect to the SRS Site (over
1,000), the Company's small volumetric ranking in comparison to the total
volume of wastes brought to the SRS Site (just under 0.5%), and the
identities of the larger generators, which include many substantial
companies, the Company believes that its liability in this matter will not
have a material effect on the Company or its financial results.  The
Company's intention is to participate in the settlement agreement finally
structured for the Site, so long as such agreement is fair to the parties.

     The Company has never had a product liability claim grounded in
environmental liability, and believes that the nature of its products and
business makes such a claim unlikely.


Employees

     The Company and its consolidated subsidiaries employ approximately
1,300 full-time persons, none of whom are represented by unions except for
the employees of the Company's Australian subsidiary and certain employees
of the Company's Spanish subsidiary.  The Company considers its relations
with its employees to be good.


Foreign Operations

     The Company's sales to customers in foreign countries primarily
involve desalination systems, water and wastewater treatment systems and
related products and services.  The Company seeks to minimize financial
risks relating to its international operations.  Wherever possible, the
Company obtains letters of credit or similar payment assurances denominated
in dollars.  If dollar payments cannot be secured, the Company, where
appropriate, enters into foreign currency hedging transactions.  The
Company also uses foreign sources for equipment parts and may borrow funds
in local (foreign) currency to offset the asset risk of foreign currency
devaluation.  Net foreign currency transaction gains included in income
before taxes totalled $157,000 in 1993, $587,000 in 1992, and $180,000 in
1991.



/13

                                     I-11
<PAGE>




     Ionics engages in certain foreign operations both directly and through
the following wholly owned subsidiaries:  Ionics (Bermuda) Ltd.; Ionics
Iberica, S.A.; Ionics (U.K.) Limited; Ionics Italba, S.p.A.; Ionics
Nederland N.V.; Global Water Services, S.A.; Elite Chemicals Pty. Ltd.; Eau
et Industrie; Resources Conservation Co. International; and Ionics Foreign
Sales Corporation Limited.

     The Company engages in various foreign operations through investments
in affiliated companies and joint venture relationships.  The activities
include the production, sale and distribution of bottled water through a
40% owned affiliate in Bahrain, a 40% owned affiliate in Saudi Arabia and a
49% owned affiliate in Kuwait.

  In addition, the Company has a 23% ownership interest in Watlington
Waterworks Ltd. in Bermuda.  Watlington collects, treats and distributes
water throughout Bermuda for both potable and non-potable uses.  The
Company also has a 50% ownership interest in Yuasa-Ionics Co., Ltd., Tokyo,
Japan, which among its other activities serves as a distributor of certain
of the Company's products in Japan.

     Further geographical and financial information concerning the
Company's foreign operations appears in Notes 1, 5, 8, 12, and 14 to the
Company's Consolidated Financial Statements included as part of the
Company's 1993 Annual Report to the Stockholders, which Notes are
incorporated herein by reference.


Financial Information About Foreign and 
Domestic Operations and Export Sales

     The information contained in Note 14 of Notes to Consolidated
Financial Statements contained in the Company's Annual Report to
Stockholders for the year ended December 31, 1993 is incorporated herein by
reference.


Item 2.  PROPERTIES

     The Company owns or leases and occupies various manufacturing and
office facilities in the United States and abroad.  The principal
facilities owned by the Company include two buildings in Watertown,
Massachusetts housing the executive offices, laboratories and manufacturing
and assembly operations; and facilities in Bridgeville, Pennsylvania;
Phoenix, Arizona; Lorton, Virginia; Elkridge, Maryland; and Milan, Italy,
for various operations relating to the design and manufacture of water
purification and treatment equipment or water-related services.  

     The two buildings in Watertown, Massachusetts which are owned by the
Company and together contain approximately 250,000 square feet, are the
subject of a mortgage securing the Company's guaranty with respect to
industrial revenue bond financing of such facilities.  The industrial
revenue bond indebtedness will be discharged in 1994.





/14

                                     I-12
<PAGE>



     The other major facility owned by the Company is its Bridgeville,
Pennsylvania facility, consisting of two buildings containing approximately
77,000 square feet and housing manufacturing operations for home water
conditioners and stainless steel fabrication.

     The Company considers the business facilities that it utilizes to be
adequate for the uses to which they are being put.


Item 3.  LEGAL PROCEEDINGS

     The Company is from time to time involved in litigation in the normal
course of its business.  At the present, the Company believes that there is
no pending or threatened litigation the result of which would have a
material adverse effect on the Company's earnings or financial position.
See "BUSINESS - Environmental Matters."


Item 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

     No matters were submitted to a vote of security holders during the
fourth quarter of the fiscal year covered by this report.




































/15

                                     I-13
<PAGE>





                                  PART II



Item 5.  MARKET FOR REGISTRANT'S COMMON EQUITY AND
         RELATED STOCKHOLDER MATTERS

     Reference is made to the Company's Annual Report to Stockholders for
the year ended December 31, 1993.  The information set forth on page 32
entitled "Common Stock Price Range" and the inside back cover of such
Annual Report is hereby incorporated by reference.


Item 6.  SELECTED FINANCIAL DATA

     Reference is made to the Company's Annual Report to Stockholders for
the year ended December 31, 1993.  The information set forth on page 32 of
such Annual Report entitled "Selected Quarterly Financial Data (unaudited)"
is hereby incorporated by reference.


Item 7.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
         CONDITION AND RESULTS OF OPERATIONS

     Reference is made to the Company's Annual Report to Stockholders for
the year ended December 31, 1993.  The information set forth on pages 17
through 19 of such Annual Report entitled "Management's Discussion and
Analysis of Financial Condition and Results of Operations" is hereby
incorporated by reference.


Item 8.  FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

     Reference is made to the Company's Annual Report to Stockholders for
the year ended December 31, 1993.  The consolidated balance sheets of the
Registrant as of December 31, 1993 and 1992, the related consolidated
statements of operations, cash flows and stockholders' equity for the years
ended December 31, 1993, 1992 and 1991, and the related notes with the
opinion thereon of Coopers & Lybrand, independent accountants, on pages 20
through 31, and Selected Quarterly Financial Data (unaudited) on page 32,
are hereby incorporated by reference.


Item 9.  CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON 
         ACCOUNTING AND FINANCIAL DISCLOSURE

     This item is not applicable to the Company.









/16


                                   II-1

<PAGE>
                                 PART III

Item 10.  DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

     The information required by Item 10 with respect to Directors is
hereby incorporated by reference from the Company's definitive proxy
statement for the Annual Meeting of Stockholders to be held May 5, 1994 to
be filed with the Securities and Exchange Commission on or about March 30,
1994.

     The information regarding executive and other officers is as follows:

                      Age as of        Positions
Name                 March 1, 1994     Presently Held

Executive Officers:

Arthur L. Goldstein*     58            President, Chief Executive Officer
                                        and Director since 1971; Chairman
                                        of the Board since 1990
Kachig Kachadurian       44            Senior Vice President since 1991 and
                                        Vice President since 1983, Director 
                                        since 1986
William E. Katz          69            Executive Vice President since
                                        1983 and Director since 1961
Robert J. Halliday       39            Vice President, Finance and Accounting
                                        since December 1990; Chief Financial
                                        Officer since August 1992.
Stephen Korn             48            Vice President, General Counsel
                                        and Clerk since September 1989
Theodore G. Papastavros  60            Vice President since 1975 and
                                       Treasurer since February 1990

Other Officers:

Alan M. Crosby           41            Vice President, Corporate Quality
                                        Programs and Watertown Operations
                                        since 1991
Edward P. Geishecker     58            Vice President, United States and Canada
                                        Sales and Marketing, Water Systems 
                                        Division since 1991
William B. Iaconelli     60            Vice President, Separations Technology
                                        since 1983
Patrick K. Lam           54            Vice President, Project Management and 
                                        International Subsidiaries since 1991
Joseph M. Loftis         52            Vice President, Fabricated Products 
                                        since 1986 and General Manager, 
                                        Bridgeville 
Leon Mir                 55            Vice President, Research and Development
                                        since September 1992
Ark W. Pang              44            Vice President, International Sales and
                                        Marketing, Water Systems Division 
                                        since 1991
Walter J. Polens         72            Vice President, Household Water
                                        Conditioning since 1968         
 
 
___________________
* Member of Executive Committee

     There are no family relationships between any of the officers or 
directors.  Officers of the Registrant are elected each year at the annual 
meeting of Directors.
/17

                                   III-1
<PAGE>





     All of the above executive officers have been employed by the Registrant in
various capacities for more than five years, except for Messrs. Halliday and
Korn.  Prior to joining the Company in December 1990, Mr. Halliday served from
April 1987 to December 1990 as Corporate Controller of Alliant Computer Systems
Corporation, a manufacturer of mini-supercomputers, and between September 1984
and April 1987 as Assistant Controller and Controller of Symbolics, Inc., a
developer and manufacturer of symbolic processing computers.  Prior to joining
the Company in 1989, Mr. Korn served as Vice President/General Counsel and
Secretary of Symbolics, Inc. from July 1986 to August 1989.  Prior to joining
Symbolics, Mr. Korn had been a member of the Boston law firm of Widett, Slater
and Goldman, P.C. for more than five years.

Item 11.  EXECUTIVE COMPENSATION

     The information required by Item 11 is hereby incorporated by reference
from the Company's definitive proxy statement for the Annual Meeting of
Stockholders to be held May 5, 1994 to be filed with the Securities and
Exchange Commission on or about March 30, 1994.


Item 12.  SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS
          AND MANAGEMENT

     The information required by Item 12 is hereby incorporated by reference
from the Company's definitive proxy statement for the Annual Meeting of
Stockholders to be held May 5, 1994 to be filed with the Securities and
Exchange Commission on or about March 30, 1994.


Item 13.  CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

     The information required by Item 13 is hereby incorporated by reference
from the Company's definitive proxy statement for the Annual Meeting of
Stockholders to be held May 5, 1994 to be filed with the Securities and
Exchange Commission on or about March 30, 1994.





















/18

                                   III-2
<PAGE>


                                  PART IV

Item 14.  EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND
          REPORTS ON FORM 8-K

(a)  1.   Financial Statements

          See Index to Financial Statements and Financial Statement
          Schedules on page IV-7.  The Financial Statement Schedules are
          filed as part of this Annual Report on Form 10-K.

     2.   Financial Statement Schedules

          See Index to Financial Statements and Financial Statement
          Schedules on page IV-7.

     3.   Exhibits

     Exhibit                                                              Page
       No.    Description                                                  No. 
         
     3.0      Articles of Organization and By-Laws

              3.1     Restated Articles of Organization (filed              *
                      as Exhibit 3(a) to Form 10-K for year 
                      ended December 31, 1986).

              3.1(a)  Amendment to the Restated Articles of                 *
                      Organization (filed as Exhibit 3(b) to 
                      Form 10-K for year ended December 31, 1987).

              3.1(b)  Amendment to Restated Articles of                     *
                      Organization (filed as Exhibit 3.1(b) to 
                      Registration Statement No. 33-38290 on
                      Form S-2 effective January 24, 1991).

              3.2     By-Laws, as amended (filed as Exhibit 19 to           *
                      Form 10-Q for the quarter ended September 30,
                      1989).

     4.0      Instruments defining the rights of security holders,
              including indentures

              4.1     Industrial Revenue Bond issued by the Town           **
                      of Watertown, Massachusetts in the amount of
                      $3,000,000 guaranteed by Registrant, and 
                      related documents.

              4.2     Agreement for a loan payable by a consolidated       **
                      subsidiary to a bank in Australia in the principal
                      amount of 725,000 Australian dollars guaranteed
                      by Registrant, and related documents.







/19


                                   IV-1
<PAGE>



              4.3     Rights Agreement, dated as of December 22, 1987,     *
                      as amended and restated as of August 15, 1989,
                      between Registrant and The First National Bank 
                      of Boston (filed as Exhibit 1 to Registrant's
                      Current Report on Form 8-K dated August 30, 1989).

              4.4     Indenture, dated as of December 22, 1987, between    *
                      Registrant and The First National Bank of Boston,
                      relating to Rights Agreement (filed as Exhibit 2 
                      to Registrant's Current Report on Form 8-K dated
                      December 22, 1987).

              4.5     Form of Common Stock Certificate (filed as Exhibit   *
                      4.10 to Registrant's Annual Report on Form 10-K 
                      for the year ended December 31, 1990).

     10.      Material Contracts

              10.1    1979 Stock Option Plan, as amended through
                      February 17, 1994.

              10.2    1986 Stock Option Plan for Non-Employee Directors,   *
                      as amended though February 18, 1992 (filed as
                      Exhibit 10.2 to Registrant's Annual Report on 
                      Form 10-K for the year ended December 31, 1991).

              10.3    Amended and Restated Credit Agreement between        * 
                      Registrant and The First National Bank of Boston
                      dated as of December 31, 1992 (filed on Exhibit
                      10.3 to Registrant's Annual Report on Form 10-K 
                      for the year ended December 31, 1992).

              10.4    Operating Agreement dated as of September 27,        *
                      1989 between Registrant and Aqua Cool Enter-
                      prises, Inc. (filed as Exhibit 10.4 to 
                      Registrant's Annual Report on Form 10-K for the
                      year ended December 31, 1989).

              10.5    Term Lease Master Agreement dated as of              *
                      September 27, 1989 between Registrant and
                      Aqua Cool Enterprises, Inc. (filed as Exhibit
                      10.5 to Registrant's Annual Report on Form 10-K
                      for the year ended December 31, 1989).

              10.6    Option Agreement dated as of September 27, 1989      *
                      among Registrant, Aqua Cool Enterprises, Inc.
                      and the other parties named therein (filed as
                      Exhibit 10.6 to Registrant's registration 
                      statement on Form S-2, No. 33-38290, 
                      effective January 24, 1991).

              10.7    Agreement for Privatization of Water Supplies        *
                      dated as of September 18, 1990 between the 
                      Company and the City of Santa Barbara, 
                      California (filed as Exhibit 10.7 to 
                      Registrant's registration statement on Form S-2,
                      No. 33-38290, effective January 24, 1991).


/20


                                   IV-2

<PAGE>





              10.8    Amendment No. 1, dated as of January 3, 1992, to     *
                      Agreement for Privatization of Water Supplies 
                      dated as of September 18, 1990 between the Company
                      and the City of Santa Barbara, California (filed as
                      Exhibit 10.8 to Registrant's annual report on 
                      Form 10-K for the year ended December 31, 1991).

              10.9    Amendment No. 2, dated as of January 19, 1993,       *
                      to Agreement for Privatization of Water Supplies
                      dated as of September 18, 1990 between the Company
                      and the City of Santa Barbara, California (filed as 
                      Exhibit 10.9 to the Registrant's annual report on
                      Form 10-K for the year ended December 31, 1992).

              10.10   Asset Purchase Agreement Among the Company,          * 
                      Resources Conservation Company, Resources
                      Conservation Co. International and Halliburton
                      NUS Corporation dated December 30, 1993 (filed as
                      Exhibit 2 to Registrant's current report on 
                      Form 8-K dated February 7, 1994 and filed
                      electronically on the same date).

     11.      Statement re Computation of Earnings Per Share.

     13.      Annual Report to Stockholders of the Registrant for 
              the year ended December 31, 1993 (only pages 17 
              through 32 and the inside back cover constitute an 
              exhibit to this report).

     22.      Subsidiaries of the Registrant.

     24.      Consents

              24.1    Consent of Coopers & Lybrand to incorporation
                      by reference of that firm's report dated 
                      February 22, 1994, which is included on page 31 of 
                      the Registrant's Annual Report to Stockholders 
                      for the year ended December 31, 1993.

     25.      Power of Attorney.
________________________________

     *   incorporated herein by reference

     **  copies of which will be filed by Registrant with 
         the Securities and Exchange Commission upon its
         request









/21


                                   IV-3

<PAGE>




(b)  Reports on Form 8-K

     No reports on Form 8-K were filed by the Registrant during the
     last quarter of fiscal 1993.

     Undertaking

     For purposes of complying with the amendments to the rules governing
     Form S-8 effective July 13, 1990 under the Securities Act of 1933, the
     undersigned hereby undertakes as follows, which undertaking shall be
     incorporated by reference into registrant's registration statements on
     Form S-8 Nos. 33-14194, 33-5814, 33-2092, 2-72936, 2-82780, 2-64255,
     33-41598, and 33-54400.  

     Insofar as indemnification for liabilities arising under the Securities
     Act of 1933 may be permitted to directors, officers and controlling
     persons of the registrant pursuant to the foregoing provisions, or
     otherwise, the registrant has been advised that in the opinion of the
     Securities and Exchange Commission such indemnification is against
     public policy as expressed in the Act and is, therefore, unenforceable.
     In the event that a claim for indemnification against such liabilities
     (other than the payment by the registrant of expenses incurred or paid
     by a director, officer or controlling person of the registrant in the
     successful defense of any action, suit or proceeding) is asserted by
     such director, officer or controlling person in connection with the
     securities being registered, the registrant will, unless in the opinion
     of its counsel the matter has been settled by controlling precedent,
     submit to a court of appropriate jurisdiction the question whether such
     indemnification by it is against public policy as expressed in the Act
     and will be governed by the final adjudication of such issue.



























/22


                                   IV-4

<PAGE>







                                SIGNATURES



     Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the registrant has duly caused this report to be
signed on its behalf by the undersigned, thereunto duly authorized.

                                    IONICS, INCORPORATED                    
                                    (Registrant)



                                    By/s/    Arthur L. Goldstein           
                                         Arthur L. Goldstein, Chairman
                                         of the Board, President and 
                                         Chief Executive Officer      
                                         
                                    Date:    March 28, 1994                



     Pursuant to the requirements of the Securities Exchange Act of 1934,
this report has been signed below by the following persons on behalf of the
registrant and in the capacities and on the dates indicated.



Date: March 28, 1994                By/s/    Arthur L. Goldstein            
                                         Arthur L. Goldstein, Chairman
                                         of the Board, President and
                                         Chief Executive Officer
                                         (principal executive officer)
                                         and Director



Date: March 28, 1994                By/s/    Robert J. Halliday             
                                         Robert J. Halliday, Vice President,
                                         Finance and Accounting and Chief
                                         Financial Officer (principal
                                         financial and accounting officer)












/23


                                   IV-5

<PAGE>









Date: March 28, 1994                By/s/    William L. Brown             
                                         William L. Brown, Director


Date: March 28, 1994                By       Arnaud de Vitry d'Avaucourt  
                                         Arnaud de Vitry d'Avaucourt,
                                         Director


Date: March 28, 1994                By/s/    Lawrence E. Fouraker         
                                         Lawrence E. Fouraker, Director


Date: March 28, 1994                By/s/    Samuel A. Goldblith          
                                         Samuel A. Goldblith, Director


Date: March 28, 1994                By/s/    Kachig Kachadurian           
                                         Kachig Kachadurian, Director


Date: March 28, 1994                By/s/    William E. Katz              
                                         William E. Katz, Director


Date:                               By/s/                                 
                                         Robert B. Luick, Director


Date:                               By/s/                                 
                                         John J. Shields, Director


DATE: March 28, 1994                By/s/    Mark S. Wrighton             
                                         Mark S. Wrighton, Director


Date: March 28, 1994                By/s/    Allen S. Wyett               
                                         Allen S. Wyett, Director



       By/s/                                 
             Stephen Korn
             Attorney-in-fact






/24


                                   IV-6

<PAGE>


                           IONICS, INCORPORATED
      INDEX TO FINANCIAL STATEMENTS AND FINANCIAL STATEMENT SCHEDULES

                                                                 PAGES

Report of Independent Accountants                                  31*

Financial Statements:

     Consolidated Statements of Operations for the Years Ended
     December 31, 1993, 1992 and 1991                              20*

     Consolidated Balance Sheets as of December 31,
     1993 and 1992                                                 21*

     Consolidated Statements of Cash Flows for the 
     Years Ended December 31, 1993, 1992 and 1991                  22*

     Consolidated Statements of Stockholders' Equity for
     the Years Ended December 31, 1993, 1992 and 1991              23*

     Notes to Consolidated Financial Statements                   24-31* 


Supporting Financial Statement Schedules for the years Ended December 31,
1993, 1992 and 1991:

     Schedule I  - Marketable Securities and Other Short-Term
     Investments                                                 IV-8

     Schedule II - Amounts Receivable from Related Parties       
     and Underwriters, Promoters and Employees other than
     Related Parties                                             IV-9

     Schedule V - Property, Plant and Equipment                  IV-10

     Schedule VI - Accumulated Depreciation, Depletion           
     and Amortization of Property, Plant and Equipment           IV-11

     Schedule VIII - Valuation and Qualifying Accounts           IV-12

     Schedule IX - Short-Term Borrowings                         IV-13
          

Report of Independent Accountants on Financial Statement         
Schedules                                                        IV-14

__________________

All other schedules are omitted because the amounts are immaterial, the
schedules are not applicable or the required information is shown in the
financial statements or the notes thereto.

*  Page references are to the Annual Report to Stockholders of the Company
   for the year ended December 31, 1993, which pages are incorporated herein
   by reference.



/25


                                   IV-7

<PAGE>





                                  IONICS, INCORPORATED

           SCHEDULE I - MARKETABLE SECURITIES AND OTHER SHORT-TERM INVESTMENTS

                                                                

<TABLE>

<CAPTION>

                                                                           
Amount at                          
                                                          Market Value   Which 
Issue is
Name of Issuer and    Principal Amount of   Cost of Each  of Each Issue    
Carried on  
Title of Each Issue  Short-Term Investment     Issue       @ 12/31/93    Balance 
Sheet 
<S>                  <C>                    <C>           <C>            <C>        
U.S. Government:
  Treasury Notes          $2,000,000         $2,000,000     $2,002,500    
$2,000,000

  Treasury Bills           3,935,742          3,935,742      3,982,940     
3,935,742

Foreign Government
Securities held by
Subsidiaries     (A)       2,667,859          2,827,031      2,753,761     
2,667,859
                          $8,603,601         $8,762,773     $8,739,201    
$8,603,601





<FN>
(A)  Foreign currencies are translated at the exchange rates in effect at the 
time of the purchase
     in determining the cost of each issue.  Foreign currencies carried on the 
Balance Sheet are
     translated at the rates in effect at December 31, 1993.

</TABLE>




















/26


                                   IV-8

<PAGE>





                                  IONICS, INCORPORATED

                SCHEDULE II - AMOUNTS RECEIVABLE FROM RELATED PARTIES AND
            UNDERWRITERS, PROMOTERS AND EMPLOYEES OTHER THAN RELATED PARTIES

                                                                

<TABLE>

<CAPTION>
                     Balance at                      Deductions       Balance at 
End of Period
                     Beginning                Amounts      Amounts       
Name of Debtor       of Period    Additions  Collected   Written Off  Current      
Non-current
<S>                  <C>          <C>        <C>         <C>          <C>          
<C>


Year ended
December 31, 1993:

Arthur L. Goldstein  $ 85,940(1)   $ -       $ 85,940      $ -        $ -            
$ -    

Arthur L. Goldstein  $ 55,620(2)   $ -       $ 55,620      $ -        $ -            
$ -    


Year ended
December 31, 1992:

Arthur L. Goldstein  $ 93,323(1)   $ -       $ 7,383       $ -        $7,759         
$ 78,181

Arthur L. Goldstein  $ 60,237(2)   $ -       $ 4,617       $ -        $4,853         
$ 50,767


Year ended
December 31, 1991:   

Arthur L. Goldstein  $100,345(1)   $ -       $ 7,022       $ -        $7,382         
$ 85,941

Arthur L. Goldstein  $ 64,629(2)   $ -       $ 4,392       $ -        $4,617         
$ 55,620





<FN>
(1)(2) The debt was evidenced by two notes which were secured by the pledge of 
Ionics,
       Incorporated common stock.  The obligations were being repaid in monthly 
principal and
       interest installments of $990 and $627, respectively, and were originally 
scheduled to
       mature in January and April 1988, respectively.  On February 26, 1987, 
the Compensation
       Committee of the Board of Directors authorized a six-year extension of 
the maturity
       date of the notes.  The interest rate was 5%.  During December 1993, both 
notes were
       repaid, including outstanding principal and interest.

</TABLE>



/27


                                   IV-9

<PAGE>




                             IONICS, INCORPORATED

                  SCHEDULE V - PROPERTY, PLANT AND EQUIPMENT

                                                        
<TABLE>

<CAPTION>
                                                
                               Balance at                                        
Other
                               Beginning        Additions                        
Changes          Balance at
Classification                   of Year        (at Cost)(A)   Retirements      
Add(Deduct)(B)    End of Year
<S>                            <C>              <C>            <C>        
Year ended December 31, 1993:
    Land                       $  1,278,496    $   305,713     $   70,000       
$  (253,685)      $  1,260,524
    Buildings                    13,752,453        858,111        746,124           
(35,635)        13,828,805
    Machinery and equipment     110,382,066     21,025,897      3,792,602        
(5,822,658)       121,792,703
    Other                        13,348,083      7,883,123      1,594,201          
(718,947)        18,918,058

                               $138,761,098    $30,072,844     $6,202,927       
$(6,830,925)      $155,800,090

Year ended December 31, 1992:
    Land                       $    917,373    $   352,329     $      -         
$     8,794       $  1,278,496     
    Buildings                    13,250,946      1,751,592        577,349          
(672,736)        13,752,453     
    Machinery and equipment      97,948,099     22,236,885      2,716,347        
(7,086,571)       110,382,066     
    Other                        12,074,621      2,353,627        474,546          
(605,619)        13,348,083     

                               $124,191,039    $26,694,433     $3,768,242       
$(8,356,132)      $138,761,098     

Year ended December 31, 1991:
    Land                       $    852,337    $    71,341     $      -         
$    (6,305)      $    917,373
    Buildings                    13,116,653        605,175        412,697           
(58,185)        13,250,946
    Machinery and equipment      68,139,382     33,399,814      1,949,033        
(1,642,064)        97,948,099
    Other                         9,944,812      2,601,705      1,576,251         
1,104,355         12,074,621
                               $ 92,053,184    $36,678,035     $3,937,981       
$  (602,199)      $124,191,039
                                                                                                  
<FN>
(A)  Additions include opening balances of newly consolidated companies of
     $11,508,734 and $435,649 in 1993 and 1992, respectively.

(B)  Other changes include net currency translation losses of $6,830,925, 
$8,356,132
     and $602,199 for the years 1993, 1992 and 1991, respectively.  Also 
included in
     other changes are transfers between classifications.
</TABLE>













/28


                                   IV-10

<PAGE>




                             IONICS, INCORPORATED

               SCHEDULE VI - ACCUMULATED DEPRECIATION, DEPLETION
               AND AMORTIZATION OF PROPERTY, PLANT AND EQUIPMENT

                                                      

<TABLE>

<CAPTION>
                                               Additions
                               Balance at      Charged to                        
Other
                               Beginning       Costs and                         
Changes          Balance at
Classification                  of Year         Expenses_      Retirements      
Add(Deduct)(A)    End of Year
<S>                            <C>             <C>             <C>

Year ended December 31, 1993:
    Buildings                  $ 5,164,921     $   613,386     $  221,289       
$  (102,762)      $ 5,454,256
    Machinery and equipment     28,636,884      12,639,660      2,182,638           
177,618        39,271,524
    Other                        7,157,859       2,012,486        254,953         
1,713,948        10,629,340
                               $40,959,664     $15,265,532     $2,658,880       
$ 1,788,804       $55,355,120
                                                                                                  

 
Year ended December 31, 1992:
    Buildings                  $ 4,774,547     $   615,242     $  112,059       
$  (112,809)      $ 5,164,921  
    Machinery and equipment     22,067,678      10,001,000      1,653,459        
(1,778,335)       28,636,884  
    Other                        6,028,357       1,677,018        416,773          
(130,743)        7,157,859  
                               $32,870,582     $12,293,260     $2,182,291       
$(2,021,887)      $40,959,664


Year ended December 31, 1991:
    Buildings                  $ 4,254,157     $   610,172     $   87,859       
$    (1,923)      $ 4,774,547
    Machinery and equipment     18,670,744       5,960,823      1,552,097        
(1,011,792)       22,067,678
    Other                        3,881,638       1,598,377        498,331         
1,046,673         6,028,357
                               $26,806,539     $ 8,169,372     $2,138,287       
$    32,958       $32,870,582


                                                                                                  





<FN>
(A)  Other changes include opening balances of newly consolidated companies of
     $3,891,723 and $294,607 in 1993 and 1992, respectively.  Other changes
     also include net foreign exchange (losses) and gains of $(2,102,919),
     $(2,316,494) and $32,958 for the years 1993, 1992 and 1991, respectively.
     Also included in other changes are transfers between classifications.

</TABLE>





/29


                                   IV-11

<PAGE>



                             IONICS, INCORPORATED

               SCHEDULE VIII - VALUATION AND QUALIFYING ACCOUNTS

                                                        

<TABLE>

<CAPTION>
                                      Additions    Additions
                         Balance at   Charged to     Due to
                         Beginning    Costs and     Acquired                      
Balance at
Description                of Year     Expenses    Businesses(A)  Deductions(B)   
End of Year
<S>                      <C>          <C>          <C>            <C>    
Allowance for doubtful
accounts and notes
receivable:

     Years ended:

     December 31, 1993   $2,694,200   $390,489     $(124,000)     $  938,621      
$2,022,068

     December 31, 1992   $2,510,588   $944,203     $ 190,200      $  950,791      
$2,694,200

     December 31, 1991   $1,752,260   $923,029       -None-       $  164,701      
$2,510,588

<FN>
(A)  1993 amount includes reductions of $413,000 resulting from the 
consolidation of ACE.

(B)  Deductions result primarily from the write-off of accounts.

</TABLE>


























/30


                                   IV-12

<PAGE>





                                     IONICS, INCORPORATED

                              SCHEDULE IX - SHORT-TERM BORROWINGS

                                                             
<TABLE>

<CAPTION>
                                     Weighted                               
Weighted
                                     Average      Maximum       Average     
Average
                                     Interest      Amount       Amount      
Interest
                         Balance      Rate at    Outstanding   Outstanding    
Rate
Category of Aggregate   at End of     End of      During the    During the  
During the
Short-Term Borrowings     Period     Period (A)     Period       Period (B) 
Period (C)
<S>                     <C>          <C>         <C>           <C>          <C>   

Notes payable to banks:

    Years ended:


     December 31, 1993  $   153,000    10.32%    $ 7,395,000   $ 1,429,000    
7.18%

     December 31, 1992  $   434,000    11.86%    $ 3,174,000   $ 1,290,000   
13.26%

     December 31, 1991  $   692,000    15.13%    $25,345,000   $ 4,079,000   
13.76%



<FN>
(A) The base interest rate charged on notes, exclusive of commitment fee.

(B) The average amount outstanding during the period was computed on a weighted
    average monthly amount.

(C) The weighted average interest rate during the period was computed by 
dividing the 
    actual interest expense by the average monthly loan balance outstanding.

</TABLE>

















/31


                                   IV-13

<PAGE>



                      REPORT OF INDEPENDENT ACCOUNTANTS


To the Board of Directors and Stockholders of Ionics, Incorporated:

     Our report on the consolidated financial statements of Ionics,
Incorporated as of December 31, 1993 and 1992 and for each of the three years
in the period ended December 31, 1993 has been incorporated by reference in
this Form 10-K from page 31 of the 1993 Annual Report to Stockholders of
Ionics, Incorporated.  In connection with our audits of such financial
statements, we have also audited the related financial statement schedules
listed in the Index on page IV-7 of this Form 10-K.

     In our opinion, the financial statement schedules referred to above, when
considered in relation to the basic financial statements taken as a whole,
present fairly, in all material respects, the information required to be
included therein.



                                             COOPERS & LYBRAND



Boston, Massachusetts
February 22, 1994
































/32


                                   IV-14

<PAGE>





                                EXHIBIT INDEX
<TABLE>
<CAPTION>                                                                 
                                                                        
Sequentially
     Exhibit                                                              
Numbered
       No.    Description                                                 Page 
No.   
     <S>      <C>                                                       <C> 
     3.0      Articles of Organization and By-Laws                            

              3.1     Restated Articles of Organization (filed                *
                      as Exhibit 3(a) to Form 10-K for year 
                      ended December 31, 1986).

              3.1(a)  Amendment to the Restated Articles of                   *
                      Organization (filed as Exhibit 3(b) to 
                      Form 10-K for year ended December 31, 1987).

              3.1(b)  Amendment to Restated Articles of                       *
                      Organization (filed as Exhibit 3.1(b) to 
                      Registration Statement No. 33-38290 on
                      Form S-2 effective January 24, 1991).

              3.2     By-Laws, as amended (filed as Exhibit 19 to             *
                      Form 10-Q for the quarter ended September 30,
                      1989).

     4.0      Instruments defining the rights of security holders,
              including indentures

              4.3     Rights Agreement, dated as of December 22, 1987,        *
                      as amended and restated as of August 15, 1989,
                      between Registrant and The First National Bank 
                      of Boston (filed as Exhibit 1 to Registrant's
                      current Report on Form 8-K dated August 30, 1989).

              4.4     Indenture, dated as of December 22, 1987, between       *
                      Registrant and The First National Bank of Boston,
                      relating to Rights Agreement (filed as Exhibit 2 
                      to Registrant's Current Report on Form 8-K dated
                      December 22, 1987).

              4.5     Form of Common Stock Certificate (filed as Exhibit      *
                      4.10 to Registrant's Annual Report on Form 10-K 
                      for the year ended December 31, 1990).

     10.      Material Contracts

              10.1    1979 Stock Option Plan, as amended                     36
                      through February 17, 1994.

</TABLE>





/33

<PAGE>



              10.2    1986 Stock Option Plan for Non-Employee Directors,      *
                      as amended though February 18, 1992 (filed as
                      Exhibit 10.2 to Registrant's Annual Report on 
                      Form 10-K for the year ended December 31, 1991).

              10.3    Amended and Restated Credit Agreement between           *
                      Registrant and The First National Bank of Boston
                      dated as of December 31, 1993.

              10.4    Operating Agreement dated as of September 27,           *
                      1989 between Registrant and Aqua Cool Enter-
                      prises, Inc. (filed as Exhibit 10.4 to 
                      Registrant's Annual Report on Form 10-K for the
                      year ended December 31, 1989).

              10.5    Term Lease Master Agreement dated as of                 *
                      September 27, 1989 between Registrant and
                      Aqua Cool Enterprises, Inc. (filed as Exhibit
                      10.5 to Registrant's Annual Report on Form 10-K
                      for the year ended December 31, 1989).

              10.6    Option Agreement dated as of September 27, 1989         *
                      among Registrant, Aqua Cool Enterprises, Inc.
                      and the other parties named therein (filed as
                      Exhibit 10.6 to Registrant's registration 
                      statement on Form S-2, No. 33-38290, 
                      effective January 24, 1991).

              10.7    Agreement for Privatization of Water Supplies           *
                      dated as of September 18, 1990 between the 
                      Company and the City of Santa Barbara, 
                      California (filed as Exhibit 10.7 to 
                      Registrant's registration statement on Form S-2,
                      No. 33-38290, effective January 24, 1991).

              10.8    Amendment No. 1, dated as of January 3, 1992, to        *
                      Agreement for Privatization of Water Supplies 
                      dated as of September 18, 1990 between the Company
                      and the City of Santa Barbara, California (filed as
                      Exhibit 10.8 to Registrant's annual report on 
                      Form 10-K for the year ended December 31, 1991).

              10.9    Amendment No. 2, dated as of January 19, 1993,          *
                      to Agreement for Privatization of Water Supplies
                      dated as of September 18, 1990 between the Company
                      and the City of Santa Barbara, California (filed as
                      Exhibit 10.9 to the Registrant's annual report on
                      Form 10-K for the year ended December 31, 1992).

              10.10   Asset Purchase Agreement among the Company,             *
                      Resources Conservation Company, Resources
                      Conservation Co. International and Halliburton
                      NUS Corporation dated December 30, 1993 (filed
                      as Exhibit 2 to Registrant's current report on
                      Form 8-K dated February 7, 1994 and filed
                      electronically on the same date).



/34

<PAGE>






     11.      Statement re Computation of Earnings Per Share.           47

     13.      Annual Report to Stockholders of the Registrant for       48
              the year ended December 31, 1993 (only pages 17 
              through 32 and the inside back cover constitute an 
              exhibit to this report).

     22.      Subsidiaries of the Registrant.                           81

     24.1     Consent of Coopers & Lybrand to incorporation             82
              by reference of that firm's report dated 
              February 22, 1994, which is included on page 31 of 
              the Registrant's Annual Report to Stockholders 
              for the year ended December 31, 1993.

     25.      Power of Attorney.                                        83





                               
* incorporated herein by reference

































/35




                                                    EXHIBIT 10.1

                           IONICS, INCORPORATED

                          1979 Stock Option Plan

                   As Amended through February 17, 1994


1.   Purposes of Plan.

     This 1979 Stock Option Plan (hereinafter called the "Plan") of Ionics,
Incorporated (hereinafter called the "Company") is intended to advance the
interests of the Company (and its subsidiaries) by providing a means whereby
key employees of the Company, that is, those who are largely responsible for
its management and its technical and business success, and are expected to
continue in this role, may be offered incentives in addition to the other
incentives which they may hold, such as pensions, etc.

2.   Definitions.

     2.1  "Subsidiaries" or "Subsidiary" shall mean a corporation,
partnership or other entity whose controlling stock or other ownership
interest is owned directly or indirectly by the Company.

     2.2  A "key employee" shall mean an employee of the Company or of any
of its Subsidiaries who is engaged in an important executive, administrative
or technical function who is classified by the Administrators of the Plan as
such within the purposes of the Plan.

3.   Effective Date and Duration.

     The Plan will become effective immediately upon its adoption by the
Board of Directors of the Company, subject, however, to approval by the
holders of a majority of the outstanding shares of its capital stock having
voting rights present at the meeting when the matter was acted upon.  The
Plan shall remain in effect until the close of business on February 15, 1997
(the "Termination Date").

4.   Stock Subject to the Plan.

     Subject to adjustment as provided hereinbelow, the total aggregate
number of shares of Common Stock, One Dollar ($1) per share par value
(hereinafter "Common Stock"), of the Company which are to be issued and
delivered upon exercise of options granted pursuant to this Plan
(hereinafter called the "Options" and each singly an "Option") or pursuant
to the earn out of Performance Units under this Plan, shall not exceed
1,455,000 shares of said Common Stock.  Such shares may either be authorized
and unissued shares of Common Stock or issued shares of Common Stock which
shall have been reacquired by the Company and held as treasury shares.  In
the event that any Options granted under the Plan shall be surrendered to
the Company or shall terminate, lapse or expire for any reason without
having been exercised in full, the shares not purchased under such Options
shall be available again for the purposes of issuance pursuant to the Plan.



     In the event that the outstanding shares of the Common Stock of the
Company are hereafter increased or decreased or changed into or exchanged
for a different number or kind of shares, or other securities of the Company
or of another corporation, by reason of reorganization, merger,
consolidation, recapitalization, reclassification, stock split-up,
combination of shares, or dividends payable in stock, corresponding
adjustments as determined by the Board of Directors in their sole discretion
to be appropriate shall forthwith be made in the Option price and in the
number and kind of shares for the purchase of which Options may theretofore
or thereafter be granted under the Plan; provided, however, the aggregate
total Option price of Options then outstanding and unexercised shall not be
changed thereby.

5.   Administration of the Plan.

     The Plan shall be administered by the Board of Directors of the Company
or such committee composed of its Directors as may be delegated this duty
and function by resolution of the Board of Directors (said Board or said
Committee, as the case may be, being hereinafter referred to as the
"Administrators").  The Administrators shall be comprised of, to the extent
required by applicable regulations under Section 162(m) of the Code, two or
more outside Directors as defined in applicable regulations thereunder and,
to the extent required by Rule 16b-3 promulgated under the Securities
Exchange Act of 1934 or any successor provision, disinterested Directors.  A
majority of the Administrators acting upon a particular matter shall have no
personal interest in the Option or matter with which they are concerned.

     Subject to the express provisions of the Plan, the Administrators
acting by a majority of their number at a meeting or by written consent
shall have plenary authority in their discretion to grant Options under the
Plan, and in relation thereto to determine from time to time those officers
or employees of the Company or of its Subsidiaries who are to receive
Options, the number of shares to be optioned to each, the Option price
(which shall not be less than the par value of the stock subject to the
Option) and the terms and conditions upon which the Options are to be
granted, which need not be identical; including, without limitation,
requirements that an exercise of the Option may be conditioned in whole or
in part upon duration of the optionee's employment, his attainment of
specified performance criteria, his refraining from competitive activities
and other conditions.  Options may be granted at any time prior to
termination of the Plan and the Options granted may extend beyond the
Termination Date.

     Subject to the express provisions of the Plan, the Administrators may
(1) construe the respective stock Option agreements and the Plan, prescribe,
amend, and rescind rules and regulations relating to the Plan and make all
other determinations necessary or advisable for administering the Plan, and
(2) correct any defect or supply any omission or reconcile any inconsistency
in the Plan or in any stock Option agreement and in the manner and to the
extent they shall deem expedient to carry it into effect and (3) constitute
and appoint a person or persons selected by them to execute and deliver in
the name and on behalf of the Administrators all such agreements,
instruments and other documents (including without limitation of the

                                   - 2 -


generality of the foregoing documents evidencing amendments of individual
stock Options and other actions delegated to the Administrators by the votes
of the Board of Directors adopted at their meeting on February 18, 1982,
relating to "incentive stock options").

     The Administrators shall have the authority in their discretion to
determine from time to time those officers or employees of the Company or of
its Subsidiaries who are eligible to receive Performance Units, as
hereinafter defined.  In connection therewith the Administrators shall have
the authority to prescribe the number of Performance Units to be granted to
any key employee and all terms thereof and to adopt, amend and rescind rules
and regulations for the administration of Performance Units.

6.   Persons to whom Options and Performance Units may be Granted.

     Only persons who are officers of, or who are "key employees" of the
Company or any of its Subsidiaries, and who accept an Option or Performance
Unit granted hereunder, as the case may be, and subject to all of the terms
and conditions of this Plan, may be granted any Options or Performance Units
under this Plan.  During any one-year period, no individual shall be granted
Options and/or Performance Units which could result in the issuance to such
individual of more than 100,000 shares of Common Stock.

7.   The Option Price.

     The price payable upon exercise of an Option granted hereunder (the
"Option Price") shall be an amount as specified by the Administrators which
shall not be less than the par value of the stock which is subject to the
Option and which shall be paid upon exercise of the Option (1) in cash, (2)
with shares of the Company of the same class as the shares issuable upon
exercise of the Option, previously acquired by the optionee and having an
aggregate fair market value equal to the aggregate Option Price payable, or
(3) in any combination of cash and of such shares so valued.  In the event
such shares are delivered to pay all or a portion of the Option Price -

     (a)  such shares shall be valued at the closing price for such stock on
          the American Stock Exchange or other exchanges or markets where
          such shares are primarily traded, as reported on the date of such
          delivery of the shares, and

     (b)  a number of the shares being issued upon exercise of the Option
          which is equal to the number of shares of such stock delivered in
          payment of the Option Price shall be issued free from repurchase
          rights of the Company under said Plan or stock Option agreement
          evidencing the Option.

8.   The Duration of the Options.

     The duration of the Options granted hereunder shall be as determined by
the Administrators but shall not exceed a period of ten years from the date
of grant.  Notwithstanding the preceding sentence, the duration of Options
not designated as Incentive Stock Options pursuant to Section 17 may be a
period of ten years and one day from the date of grant.

                                   - 3 -



9.   Nontransferability of Options.

     No Option granted under the Plan shall be encumbered, assigned, or
otherwise transferred, and an Option may be exercised during the lifetime of
the Optionee only by such person, and the stock Option agreement covering
the Option shares shall so provide.

10.  Exercise of Options.

     The exercise, in whole or in part, of any Option granted under the Plan
shall be :

     (a)  subject to compliance of all conditions or restrictions stated in
          Section 11 of this Plan or imposed at the time the Option is
          granted, and

     (b)  exercisable only by the employee to whom granted and while he
          remains in the employment of the Company or any of its
          Subsidiaries, except that -

          (1)  if the employee holding the Option ceases to remain in such
               employment for any reason other than his or her voluntary
               termination or his or her being terminated by the Company (or
               its Subsidiary employing said employee) because of his
               malfeasance, violation of this or any other agreement with
               the Company (or its employing Subsidiary), or other like
               justifiable cause, the employee shall have the right within
               thirty (30) days after said termination to exercise the
               Option to the extent it would have been exercisable by the
               employee immediately before the employee's termination, and
 
          (2)  if the employee holding the Option shall die while in said
               employment or within said 30-day period after its termination
               as described in sub-paragraph (1) above, the Option, to the
               extent exercisable by said employee at the time of his death,
               may be exercised within ninety (90) days after his death by
               the executor or administrator of the employee's estate.

     Options shall be exercised in each instance by the person entitled to
exercise them by giving written notice of exercise to the Company (to its
Treasurer) substantially in the form of Exhibit A annexed hereto and
tendering payment of the entire Option Price payable.

     Unless the shares deliverable upon exercise of Options are registered
or qualified for public sale by an effective Registration Statement of the
Company under the Securities Act of 1933, as amended (or any superseding
law) and are registered or qualified for sale under all applicable state
securities laws, the person to whom the stock is issued and delivered
hereunder shall confirm to the Company that the recipient is purchasing the
shares for investment and not with a view to effecting any distribution or
resale of the shares.

     In no instance may an Option be exercised for less than one full share
of the stock.

                                   - 4 -



11.  Restrictions Applicable to Stock Issued and Delivered Under the Plan.

     11.1 The Company may elect in granting an Option to include a provision
          that during the period of five years from the date of grant of the
          Option, the Company shall have the right to repurchase stock
          acquired by exercise of the Option, at a price payable in cash
          equal to the price which the Company received upon its issuance,
          to the following extent

          If the Repurchase right      Portion of the Shares
          arises prior to              Subject to Repurchase

          the end of first year                 All

          the end of the second year   the excess of 20% of the 
                                       Option shares held

          the end of the third year    the excess of 40% of the
                                       Option shares held

          the end of the fourth year   the excess of 60% of the
                                       Option shares held

          the end of the fifth year    the excess of 80% of the
                                       Option shares held

          After the fifth year of                None
            holding

          and upon the following events:

     (a)  if the employee issued the Option shall cease to be an employee of
          the Company or of any of its Subsidiaries because of the
          employee's voluntary termination of said employment or his being
          terminated therefrom because of his malfeasance, violation of this
          or any other agreement with the Company or said Subsidiary for
          like justifiable cause, and/or

     (b)  before the participant may sell or transfer the stock in any
          manner, whether voluntarily, by action of law or otherwise.

          Said right of the Company to repurchase the stock may be exercised
          by the Company at any time within thirty (30) days after it has
          notice of any such event.  At the closing of said purchase (which
          shall be held on the fifth business day following the Company's
          delivery of written notice to the holder that the Company has
          elected to so purchase the shares) the Company shall pay the
          purchase price to the holder against its receipt of delivery of
          the stock certificates representing the stock being purchased,
          duly endorsed or with duly executed stock powers to effect
          transfer of the stock to the Company.  If the Company doers not
          elect to exercise said repurchase right within said period, the
          holder shall be free to sell or transfer the stock free of such

                                   - 5 -


          restriction, but unless said stock has been registered or
          qualified for public sale under an effective Registration
          Statement or other authorization under the Securities Act of 1933,
          as amended (or under any superseding law) and qualified for public
          sale under any applicable state securities laws, the holder shall
          not so sell or transfer without prior written notice to the
          Company and furnishing to the Company an opinion of legal counsel
          or of said regulatory authority, satisfactory to the Company, that
          no such registration or qualification of the stock is required in
          the circumstances.

     11.2 Each stock certificate representing stock issued upon exercise of
          an Option hereunder shall bear such legend referring to these
          restrictions as the Company may require, and it shall not transfer
          ownership of such stock on its records except upon compliance with
          these restrictions.

12.  Stock Option Agreement Required.

     Each stock Option granted under the Plan shall be evidenced by a "Stock
Option Agreement" between the Company and the employee granted the Option,
to be in such form as the Administrators in granting the Option shall
determine, provided that said Stock Option Agreement shall in any event
include an undertaking on the part of the Employee to whom the Option is
granted (the "Optionee") that in consideration for the grant of such Option,
the Optionee will not at any time during his employment by the Company or by
any of its Subsidiaries (as defined in the Plan) or within two (2) years
following the date of termination of said employment, without the written
consent of the Company, directly or indirectly, accept employment from, or
engage in any work or activities as an employee, officer, Director, agent,
consultant, partner, proprietor or principal stockholder for any other
corporation, person or entity which is substantially competitive to the
business in which the Company or its Subsidiaries are then engaged.

13.  Effect of the Option.

     The grant of an Option under the Plan shall not entitle the Optionee to
have or claim any rights of a stockholder of the Company (whether as to
dividends, voting rights or otherwise).

     Neither the grant of an Option nor the making of any Stock Option
Agreement under this Plan shall confirm upon the Optionee any right with
respect to continuation of his or her employment nor shall it affect or
restrict the right of the Company, any Subsidiary of it, or any assuming
Company, or any successor of either of them employing the Optionee to
terminate such employment at any time.

14.  Termination, Suspension, Amendment or Modification of the Plan.

     The Board of Directors of the Company may at any time amend, alter,
suspend or terminate the Plan provided that:

     (a)  No change shall be made which, in the judgment of its Board of
          Directors, will have a material adverse effect upon any Option
          previously granted under this Plan unless the consent of the
          Optionee is obtained in writing.

                                   - 6 -



     (b)  Without the approval by the holders of a majority of the
          outstanding shares of its capital stock having voting rights,

          (1)  the maximum number of shares reserved for issuance upon the
               exercise of Options under the Plan may not be changed; and

          (2)  the classes of employees to whom Options may be granted under
               the Plan may not be changed.

15.  Merger, Consolidation or Sale of the Entire Business of the Company.

     If, prior to the expiration of the Plan, or the period of restriction
during which the Company may have or may obtain rights to repurchase stock
issued hereunder pursuant to Section 11 of the Plan, the Company shall merge
with, consolidate in or with, or sell all or substantially all of its assets
and business to another corporation or entity (other than a company or
entity which continues under the control of the same persons who were the
stockholders or owners of the Company immediately prior to the event), all
Options then outstanding shall become subject to exercise in full and all of
said repurchase rights of the Company shall terminate as of the effective
date of said transaction.

16.  Optionee Shall Comply with Applicable Laws and Regulations upon
     Exercise.

     Upon exercise of any Option granted hereunder, the person exercising
the Option shall file any and all reports if any, required of such person
under the Securities Exchange Act of 1934, as amended, or otherwise.

17.  Incentive Stock Options.

     The special terms and conditions of this Section 17 shall apply to
Stock Options granted hereunder which meet any of the following requirements
("Incentive Stock Options"):

          (a)  Options considered under the Internal Revenue Code to have
               been granted on or after January 1, 1981, and before August
               14, 1981, as to which the Optionee consents in writing to the
               application of this Section 17; and

          (b)  Options granted on or after August 14, 1981, and before
               February 18, 1982, which the Administrators designate in the
               Stock Option Agreement as Incentive Stock Options, and as to
               which the Optionee consents in writing to the application of
               this Section 17; and

          (c)  Options granted on or after February 18, 1982, which the
               Administrators designate in the Stock Option Agreement as
               Incentive Stock Options.

     The following special terms and conditions (in all of which, any
reference to the date of grant of a Stock Option shall mean the date on
which the Stock Option is considered to have been granted under Sections 421

                                   - 7 -


through 425 of the Internal Revenue Code and the regulations issued
thereunder) shall apply to all Incentive Stock Options:

     17.1 Option Price.  The Option Price shall be not less than the fair
          market value of the stock covered by the Option, determined as of
          the date of grant of the Option.

     17.2 Prior Outstanding Option.  No Incentive Stock Option may be
          exercised while there remains outstanding, within the meaning of
          Section 422A(c)(7) of the Internal Revenue Code, any other
          Incentive Stock Option which was granted at an earlier date to the
          Optionee to purchase stock in this Corporation or in any other
          corporation which is on the date of grant of the later Option
          either a parent or subsidiary corporation of this Corporation, or
          a predecessor corporation of any of such corporations.  The Stock
          Option Agreement for every Incentive Stock Option shall include a
          provision to this effect.  The two preceding sentences shall have
          no application to any Incentive Stock Option granted after
          December 31, 1986.

     17.3 No Further Grants.  No Option granted after February 15, 1989,
          shall be designated an Incentive Stock Option.

     17.4 Ten Percent Stockholder.  If any Optionee to whom an Incentive
          Stock Option is to be granted pursuant to the provisions of the
          Plan is on the date of grant the owner (as determined under
          Section 424(d) of the Internal Revenue Code) of stock possessing
          more than 10% of the total combined voting power of all classes of
          stock of this Corporation or any of its subsidiaries, then the
          following special provisions shall be applicable to the Option
          granted to such individual:

          (i)  The Option Price per share of stock subject to such Incentive
               Stock Option shall not be less than 110% of the fair market
               value of one share of stock on the date of grant; and

          (ii) The Option shall not have a term in excess of five (5) years
               from the date of grant.

     Except as modified by the preceding provisions of this Section 17, all
the provisions of the Plan shall be applicable to the Incentive Stock
Options granted hereunder.

18.  Special Bonus Grants.  The Administrators may, but shall not be
required to, grant in connection with any Option which is not designated an
Incentive Stock Option a special bonus in cash in an amount not to exceed
the combined federal and state income tax liability incurred by the Option
holder as a consequence of his acquisition of stock pursuant to the exercise
of the Option, and payment of the bonus; payable, at the discretion of the
Administrators, in whole or in part to federal and state taxing authorities
for the benefit of the Option holder at such time or times as withholding
payments of such income tax may be required, and the remainder, if any, to
be paid in cash to the Optionee at the time or times at which he is required
to make payment of such tax.  In the event that an Option with respect to

                                   - 8 -


which a special bonus has been granted becomes exercisable by the personal
representative of the estate of the Optionee in accordance with Section 10,
the bonus shall be payable to or for the benefit of the estate in the same
manner and to the same extent as it would have been payable to or for the
benefit of the Optionee had he survived to the date of exercise.  A special
bonus may be granted simultaneously with a related Option, or granted
separately with respect to an outstanding Option granted at an earlier date.
In the case of an Optionee who is an officer or a director of the Company,
an Option with respect to which a special bonus is granted may be exercised:

     (a)  no earlier than six months after the date on which the bonus is
          granted; provided, however, that this limitation shall not apply
          in the event that the Optionee dies or becomes disabled before the
          expiration of six months after the date on which the bonus is
          granted; and

     (b)  only within one of the following:

          (i)   a period beginning on the third business day and ending on
                the twelfth business day following the release for
                publication by the Company of a quarterly or annual summary
                statement of its sales and earnings; or

          (ii)  a period beginning on the first day and ending on the
                thirtieth day following the date of approval by the
                stockholders of the Company of (x) any consolidation or
                merger of the Company in which the Company does not survive
                as an independent, publicly owned corporation, or pursuant
                to which shares of Common Stock would be converted into
                cash, securities, or other property (other than a merger in
                which the holders of Common Stock immediately before the
                merger have the same proportionate ownership of common stock
                of the surviving corporation after the merger), or (y) a
                transfer of all or substantially all of the assets of the
                Company (other than a transfer to a subsidiary corporation
                controlled by the Company), or (z) the liquidation or
                dissolution of the Company; or

          (iii) a period beginning on the first day and ending on the
                thirtieth day following (x) the acquisition of beneficial
                ownership of thirty percent (30%) or more of the outstanding
                voting shares of the Company, whether in one transaction or
                a series of transactions, by another corporation, entity or
                person or group of corporations, entities or persons
                theretofore beneficially owning less than thirty percent
                (30%) of such shares, or (y) the first purchase of shares
                pursuant to a tender or exchange offer (other than one made
                by the Company) for voting shares of the Company or
                securities convertible into voting shares, after which offer
                the offeror, if successful, will become the beneficial owner
                of at least 30% of the outstanding voting shares of the
                Company.

     For purposes of this Section 18, the income tax liability incurred by
the Option holder shall be calculated as described in the attached appendix

                                   - 9 -


A, as of the date on which an amount is includible in the Option holder's
income pursuant to Section 83 of the Internal Revenue Code of 1986 as a
consequence of his acquisition of stock pursuant to the exercise of an
Option.  The fair market value of the Option stock shall be its closing
price on the American Stock Exchange or other exchanges or markets where
such shares are permanently traded, for the date in question, and the tax
rate applicable to an Option holder shall be the single rate or the highest
graduated rate (exclusive of surtax) applied to earned income by a relevant
taxing jurisdiction.

19.  Performance Units.  All Performance Units granted under the Plan shall
be on the following terms and conditions (and such other terms and
conditions that the Administrators may establish which are consistent with
the Plan):

     (a)  A Performance Unit is defined as the right of a key employee who
          has been granted the same to receive cash and/or Common Stock
          and/or Options conditioned upon and measured by the attainment of
          financial goals set by the Administrators.  Performance Units
          granted under the Plan shall be evidenced by agreements in such
          form and containing such terms and conditions, not inconsistent
          with the Plan, as the Administrators may approve.

     (b)  The Administrators shall determine the number of Performance Units
          to be granted to each key employee selected for an award and may
          establish a stated value (the "Stated Value") of each Performance
          Unit.

     (c)  Payment of Performance Units shall be made by the Company to the
          extent that such Performance Units are earned out by attainment of
          the performance objectives set for such Performance Units by the
          Administrators pursuant to subsection (d) below.  Such payment may
          be in the form of the grant of Options, or, if made in cash or
          shares of Common Stock, shall have a value equal to the dollar
          value of the Performance Units earned out.  Subject to the
          provisions of Section 5, payment of the amounts to which
          participants are entitled to be paid in respect of Performance
          Units as provided above shall be made in cash, shares of Common
          Stock or Options, or in some combination thereof, as the
          Administrators may determine.  The Administrators, in their sole
          discretion, may defer distribution of one-half of the amount of
          the payment for a period up to twelve months following the date in
          which the decision as to entitlement to payment is made.

     (d)  The award period ("Award Period") in respect of any Performance
          Units shall be a period set by the Administrators.  At the time
          each grant of Performance Units is made, the Administrators shall
          establish performance objectives to be attained within the Award
          Period as a condition of such Performance Units being earned out.
          The performance objectives shall be based on a specific dollar
          amount of growth or on a percentage rate of improvement in such
          elements as the Company's (or a subsidiary's) earnings per share,
          income, return on equity or such other measures related to growth
          or improvement of the Company (or its Subsidiaries) as the

                                  - 10 -


          Administrators shall determine.  The Administrators shall
          determine whether the performance objectives in respect of an
          Award Period have been attained, as well as the value of the
          Performance Units consequently earned out.

     (e)  In the event that recipient of a grant of Performance Units ceases
          to be a key employee prior to the end of the Award Period by
          reason of disability or death, his Performance Units if ultimately
          earned out shall be payable at the end of the Award Period in
          proportion to the active service of the key employee during the
          Award Period, as determined by the Committee.  Upon any other
          termination of employment, Performance Units and all rights
          associated therewith shall terminate unless the Administrators in
          their discretion shall determine otherwise.  For purposes of this
          subsection, the term "disability" means disability as defined in
          any disability program maintained by the Company or a subsidiary.

     (f)  Performance Units may not be transferred otherwise than by will or
          the laws of descent.

     (g)  If, as a result of any change in accounting principles or
          practices or the method of their application or in any tax or
          other laws or regulations, the earnings per share or other
          established criteria of the Company or its Subsidiaries as
          reported in the Company's annual report to stockholders differs
          materially from the earnings per share or other such criteria
          which would have been reported absent such change, the
          Administrators may, in their discretion, equitably adjust the
          reported earnings per share or other such criteria used in
          determining the attainment of any performance objectives
          previously established by the Administrators as a condition of
          earning out Performance Units.

     (h)  In the event of a stock dividend or other transaction described in
          the last paragraph of Section 4, the Administrators may make
          appropriate adjustments in performance objectives, such as
          earnings per share, for outstanding Performance Units.  In the
          event of a merger, consolidation, acquisition or liquidation
          described in the Section 15, all outstanding Performance Units and
          all rights relating thereto shall terminate, except as otherwise
          determined by the Administrators.

     (i)  No payments will be made with respect to Performance Units unless
          arrangements satisfactory to the Administrators are made for any
          federal income tax withholding or other withholding required.

     (j)  Unless Shares deliverable upon earn out of Performance Units are
          registered or qualified for public sale by an effective
          Registration Statement of the Company under the Securities Act of
          1933, as amended (or any superseding law) and are registered or
          qualified for sale under all applicable state securities laws, the
          person to whom the Common Stock is delivered shall confirm to the
          Company that such recipient is purchasing the Shares for
          investment and not with a view to effecting any distribution or
          resale of the Shares.

                                  - 11 -





<TABLE>

                                       EXHIBIT 11
                                  IONICS, INCORPORATED

                           COMPUTATION OF EARNINGS PER COMMON
                               AND COMMON EQUIVALENT SHARE

                                                       
<CAPTION>
                                                      YEARS ENDED DECEMBER 31          

                                                1993            1992            1991      
<S>                                          <C>             <C>             <C>
Net Income                                   $13,807,000     $12,820,000     $8,278,000

Calculation of primary earnings per
share:

Weighted average common shares outstanding     6,935,000       6,756,000      5,568,000

Increase from assumed exercise of 
stock options and investment of pro-
ceeds in treasury stock, based upon
average market prices                            125,000         163,000        135,000

Weighted average number of common and 
common equivalent shares outstanding           7,060,000       6,919,000      5,703,000

Earnings per common and common
equivalent share                                   $1.96           $1.85          $1.45


Calculation of fully diluted earnings per
share: 

Weighted average common and common equivalent
shares outstanding used in calculation
of primary earnings per share                 7,060,000        6,919,000      5,703,000

Increase from assumed exercise of stock
options and investment of proceeds in
treasury stock, based upon year-end
market price                                      4,000           12,000          6,000

Weighted average number of common and
common equivalent shares used to calculate
fully diluted earnings per share              7,064,000        6,931,000      5,709,000

Earnings per common and common
equivalent share assuming full dilution           $1.95(A)         $1.85          $1.45   


(A) Dilution is less than 3% so the primary
    basis was used for per share calculations.
</TABLE>

/47


<PAGE>

                                  EXHIBIT 13
                             IONICS, INCORPORATED
                       ANNUAL REPORT TO STOCKHOLDERS OF
                         IONICS, INCORPORATED FOR THE
                      FISCAL YEAR ENDED DECEMBER 31, 1993

              (Only pages 17 through 32 and the inside back cover
                      constitute an Exhibit to Form 10-K)
                                                       














































/48


<PAGE>
     MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
     RESULTS OF OPERATIONS
     
     Results of Operations 
     
     
        In 1993, Ionics continued to improve its financial performance
     with a 13% growth in revenues and a 6% improvement in earnings
     per share. The profit improvement was driven primarily by the
     continued success of "own and operate" and service-based
     activities relating to the Water and Chemical Supply and Consumer
     Water Products business segments which combined to produce an
     improvement over 1992 in earnings before interest and taxes of
     42%. This improvement more than offset a decline in the
     profitability of the Membranes and Related Equipment segment
     which was caused primarily by a slowdown in bookings and the
     acceptance and execution of orders at lower than normal margins.
     
        Total revenues were $175.3 million in 1993, compared with
     $155.2 million in the prior year. Revenues increased for all
     business segments with the largest growth in the Membranes and
     Related Equipment segment. Revenue growth in this segment was due
     to sales of ultrapure water systems, particularly to the
     semiconductor industry. A portion of the increase in 1993
     revenues was attributable to the acquisition of the French
     subsidiary, Eau et Industrie, in December 1992, and Resources
     Conservation Company (RCC) in December 1993. Revenues from the
     Water and Chemical Supply business segment increased as large
     Company-owned plants, which commenced operations in the first
     quarter of 1992, operated for the entire period in 1993, and as
     domestic chemicals sales grew. Consumer Water Products revenues
     increased with the further development of the bottled water
     business and the consolidation of Aqua Cool Enterprises, Inc.
     (ACE), our domestic distributor, as of May 26, 1993. The
     increases in domestic equipment revenues, the expansion of the
     domestic chemical business, and the additions of ACE and RCC were
     responsible for the 21% growth in the U.S. geographic segment. 
     
        Total revenues were $155.2 million in 1992, compared with
     $138.1 million in the prior year. The primary reason for the
     growth in 1992 over 1991 was the Company's increased investment
     in own and operate facilities, including those brought on line
     for the City of Santa Barbara and for the Diablo Canyon Power
     Plant of Pacific Gas and Electric. These facilities were also
     primarily responsible for the 48% growth in revenues of the Water
     and Chemical Supply business segment and the 20% growth in
     revenues of the U.S. geographic segment. The Membranes and
     Related Equipment segment realized a 6% sales increase in 1992
     primarily due to sales of membrane systems for water and food
     processing applications. The Consumer Water Products segment's
     1992 revenues declined 9% from 1991. This decline was largely
     caused by reduced sales of our HYgeneR silver-impregnated
     activated carbon filtering media to our largest HYgene customer
     due to depressed economic conditions. 
/49
<PAGE>

     
     
        Cost of sales as a percentage of revenues were 66.8%, 64.4%,
     and 65.4% in 1993, 1992 and 1991, respectively. Cost of sales as
     a percentage of revenues increased for the Membranes and Related
     Equipment segment while it held steady or declined for the Water
     and Chemical Supply and the Consumer Water Products segments,
     respectively. The increase in the Membranes and Related Equipment
     segment reflected greater than anticipated costs on several
     sizable capital equipment sales. The Consumer Water Products
     segment showed an improvement in the cost of sales percentage
     primarily due to a steady decline in the Company's unit costs to
     manufacture and distribute bottled water and coolers resulting
     from significant increases in volume, route density and operating
     efficiencies. 
     
     
        The improvement in 1992 compared to 1991 was due primarily to
     reduced costs as a percentage of sales for membrane-based
     equipment and bottled water products. Water and Chemical Supply
     costs as a percentage of sales increased partially because of
     start-up costs and initial excess capacity in connection with the
     Company's expansion of its Elite Chemicals New England plant, and
     because nearly all of the costs associated with the Santa
     Barbara desalination plant are classified as cost of product,
     resulting in superior operating margins but below average gross
     margins. 
     
     
        Operating expenses as a percentage of revenues were 23.5% in
     1993, down from 26.1% in 1992 and 27.2% in 1991. The improvement
     in 1993 reflected the absorption of relatively fixed operating
     expenses by increased sales volume, with further reductions
     achieved through expense controls. The decrease in 1992 compared
     to 1991 reflected the low operating expenses associated with
     large own and operate facilities. 
     
     
        Interest income in 1993 was $1.8 million compared to $2.1
     million in 1992 and $1.5 million in 1991. The decrease in 1993
     was due to lower average interest rates combined with reduced
     investments as a result of the 1993 purchase of ACE's preferred
     stock, the 1992 acquisitions, and additions to property, plant
     and equipment. The increase in 1992 compared to 1991 reflected
     higher average invested balances due to the remaining proceeds of
     the Company's public offerings of common stock in 1992 and 1991.
     The Company had virtually no interest expense in either 1993 or
     1992 after interest expense of $1.4 million in 1991. This
     decrease primarily resulted from the repayment of debt with
     public offering proceeds and cash from operations. 
/50
<PAGE>
     
     
        The Company's effective tax rate was 30% in 1993, 29% in 1992
     and 28% in 1991. The increase in the effective tax rate for both
     1993 and 1992 was largely due to changes in the mix of earnings
     and effective tax rates among the different jurisdictions in
     which the Company operates, as well as a proportionately lower
     benefit from the Company's foreign sales corporation. The
     increase in 1992 was partially offset by a benefit from tax-
     exempt interest and a lower state tax rate due to proportionately
     lower domestic income.
     
     
        Net income increased 7.7% to $13.8 million in 1993 compared to
     $12.8 million in 1992. Net income in 1992 was 54.9% higher than
     1991 net income of $8.3 million. Net income as a percentage of
     revenues was 7.9% in 1993 compared to 8.3% in 1992 and 6.0% in
     1991. 
     
     
        The Company adopted Financial Accounting Standards Board
     (FASB) Statement No. 109 " Accounting for Income Taxes" for the
     year 1993, with no material effect on its financial statements. 
     
     LEGAL PROCEEDINGS 
     
        The Company has been named as one of many potentially
     responsible parties (PRPs) in connection with two Superfund
     sites. During 1992, the Company paid $381,000 to the settlement
     trust fund for the Silresim Site in Lowell, Massachusetts. The
     Company was also notified during 1992 that it is one of more than
     1,000 PRPs at a Superfund site in Southington, Connecticut. The
     Company's volumetric share at this site is just under 0.5%, and a
     remediation plan has not yet been adopted. 
     
     
        The Company's volumetric contribution at these sites is low
     and there are many PRPs that are larger, financially sound
     corporations with higher volumetric levels. The Company accrues
     for estimated expenses as facts become known during these
     proceedings. Based upon facts presently known, management
     believes that the Company's liability in connection with these
     sites will not have a material adverse impact on its results of
     operations or financial condition. 
/51
<PAGE>

     
        FINANCIAL CONDITION 
     
        At December 31, 1993, the Company had total assets of $249.6
     million compared to total assets of $224.6 million at December
     31, 1992 and $178.0 million at December 31, 1991. The major
     components of the increase in 1993 related to: (1) the
     consolidation of ACE in May 1993 and the acquisition of RCC in
     December 1993, and (2) expenditures for property, plant and
     equipment primarily relating to expansions of the Company's
     bleach production and distribution operations; bottled water
     operations; and triple-membrane trailers for the production of
     ultrapure water. The major components of the 1992 increase were:
     property, plant and equipment, due to expenditures for the
     California projects for the City of Santa Barbara and the Diablo
     Canyon Power Plant; triple membrane ultrapure water trailers; and
     the expansion of the Company's bleach business. In addition, cash
     and short-term investments increased due to the Company's
     February 1992 public offering of common stock. 
     
     
        Working capital in 1993 decreased by $14.4 million and the
     Company's current ratio decreased to 2.4 in 1993 from 3.6 in
     1992. Capital expenditures totaled $14.7 million, $24.7 million,
     and $34.9 million in 1993, 1992 and 1991, respectively. Cash paid
     for the 1993 purchase of ACE's preferred stock and 1992
     acquisitions, net of cash acquired, was $8.0 million and $2.4
     million, respectively. Funds for these expenditures were provided
     in 1993 through cash from operations and the sale of short-term
     investments and in 1992 through the sale of common stock and cash
     from operations. 
     
     
        Net cash generated by operating activities decreased by $2.3
     million in 1993 with higher net income and depreciation offset by
     increases in operating assets, primarily in accounts receivable,
     and decreases in liabilities primarily in accounts payable and
     accrued expenses, excluding those obtained through the
     consolidation of ACE and acquisition of RCC.  Net cash used by
     investing activities decreased by $52.2 million in 1993 as
     compared to 1992. During 1993, cash used for investments in
     property, plant and equipment and for the purchase of ACE's
     preferred stock was funded primarily by the sale of short- term
     investments and partially by cash provided by operations. In
     1992, purchases of short-term investments were funded primarily
     by the sale of common stock and partially by cash provided by
     operations. In 1993, net cash provided by financing activities
     decreased by $47.7 million as no public offering of common stock
     occurred in 1993. During 1992, cash of $54.0 million was provided
     from the sale of common stock. Net payments of debt decreased to
     $0.9 million in 1993 compared to $7.4 million in 1992. 
/52
<PAGE>
     
     Significant expenditures in 1994 will include: payment for the
     purchase of RCC; capital for ultrapure water trailers; expansion
     of the bottled water and bleach businesses; and improvements to
     manufacturing equipment. The Company maintains several lines of
     credit, including unused domestic lines totaling $35 million,
     which are available to meet working capital needs. In addition,
     the Company has several facilities to accommodate its foreign
     trade and exchange requirements. The Company believes that its
     cash and short-term investments of $30.1 million at the beginning
     of 1994, cash from operations, lines of credit and foreign
     exchange facilities are adequate to meet its currently
     anticipated needs. 
     
     
        Inflationary increases in material and labor costs remained
     moderate during the last three years , and to the extent
     permitted by the competitive environment, the Company has raised
     prices to cover those inflationary increases. 











































/53
<PAGE>
  
  Consolidated Statements of Operations Ionics, Incorporated
<TABLE>  
<CAPTION>
  For the years ended December 31 
  Dollars in thousands, except 
    per share amounts                        1993        1992        1991
  <S>                                       <C>         <C>         <C>
  
  Net revenue :
    Membranes and related equipment         $ 92,352    $ 81,019    $ 76,267
    Water and chemical supply                 51,513      46,698      31,491
    Consumer water products                   31,408      27,523      30,362
                                             175,273     155,240     138,120
  
  Costs and expenses:
    Cost of membranes and related equipment   65,890      52,352      51,610
    Cost of water and chemical supply         36,035      32,594      21,312
    Cost of consumer water products           15,078      14,985      17,387
    Research and development                   3,678       3,084       2,886
    Selling, general and administrative       37,432      37,409      34,743
                                             158,113     140,424     127,938
  
  Income from operations                      17,160      14,816      10,182
  Interest income                              1,789       2,092       1,491
  Interest expense                                 -          (5)     (1,436)
  Equity income                                  775       1,281       1,412
  Income before income taxes    
    and minority interest                     19,724      18,184      11,649
  Provision for income taxes                   5,917       5,273       3,262
  Income before minority interest             13,807      12,911       8,387
  Minority interest's share of income              -         (91)       (109)
  
  Net income                                $ 13,807    $ 12,820    $  8,278
  
  Earnings per share                        $   1.96    $   1.85    $   1.45 
  Shares used in earnings per    
    share calculations                      7,060,000    6,919,000  5,703,000
  
</TABLE>  
  
  
  
  The accompanying notes are an integral part of these financial statements.

/54
<PAGE>
  
  Consolidated Balance Sheets              Ionics, Incorporated
<TABLE>  
<CAPTION>
  
  December 31 
  Dollars in thousands                       1993           1992 
  <S>                                      <C>            <C>
    Assets 
    Current assets:
    Cash and cash equivalents              $ 21,534       $ 13,535
    Short-term investments                    8,603         28,281
    Notes receivable, current                 2,505          3,195
    Accounts receivable                      57,214         43,640
    Receivables from affiliated companies     2,944          4,096
    Inventories                              13,926         12,314
    Other current assets                      3,231          3,696
  
      Total current assets                  109,957        108,757 
  
  Notes receivable, long-term                 4,919         10,156 
  Investments in affiliated companies         4,989          4,279 
  Property, plant and equipment, net        100,445         97,801
  Other assets                               29,252          3,597
  
      Total assets                         $249,562       $224,590 
  
  Liabilities and Stockholders' Equity 
  Current liabilities:
    Notes payable and current 
      portion of long-term debt            $    326       $    975
    Accounts payable                         12,496         12,272
    Other current liabilities                32,332         16,060
    Taxes on income                             928          1,192
  
      Total current liabilities              46,082         30,499 
  
  Long-term debt and notes payable              109            439 
  
  Deferred income taxes                       2,699          2,777 
  Other liabilities                             591            535 
  Commitments                                     -              -
  
  Stock holders' equity:
      Common stock, par value $1, authorized shares: 
      30,000,000 in 1993 and 1992; 
      issued: 6,945,805 in 1993 and 
        6,908,513 in 1992                     6,946          6,909
      Additional paid-in capital            124,189        123,148
      Retained earnings                      75,574         61,767
      Cumulative translation adjustments     (6,628)        (1,484)
  
      Total stockholders' equity            200,081        190,340
      Total liabilities and 
         stockholdersU equity              $249,562       $224,590
</TABLE>  
  The accompanying notes are an integral part of these financial statements. 

/55
<PAGE>
  
  Consolidated Statements of Cash Flows              Ionics, Incorporated
<TABLE>
<CAPTION>  
  For the years ended December 31 
  Dollars in thousands                                 1993       1992       1991
  <S>                                                <C>        <C>        <C>
  Operating activities:                              
    Net income                                       $ 13,807   $ 12,820   $  8,278
    Adjustments to reconcile net income to net cash
    provided by operating activities:
      Depreciation and amortization                    15,463     12,588      8,530
      Provision for losses on accounts 
        and notes receivable                              390        944        923
    Deferred income tax provision (benefit)             1,589        562       (571)
    Changes in assets and liabilities, net of effects
    of businesses acquired:
      Notes receivable                                 (1,175)    (2,699)    (2,489)
      Accounts receivable                              (7,332)    (2,209)    (5,989)
      Inventories                                      (1,509)      (748)     2,594
      Other current assets                                498     (2,016)       282
      Investments in affiliates                          (641)      (250)      (263)
      Accounts payable and accrued expenses            (7,432)    (1,819)     6,129
      Income taxes                                       (987)    (2,481)       472
      Other                                              (825)      (567)       276
      Net cash provided by operating 
        activities                                     11,846     14,125     18,172
  
  Investing activities:
    Additions to property, plant and 
      equipment                                       (14,667)   (24,698)   (34,862)
    Sale/(Purchase) of short-term 
      investments                                      19,129    (28,623)         -
    Acquisitions, net of cash acquired                 (7,959)    (2,352)         -
      Net cash used by investing 
       activities                                      (3,497)   (55,673)   (34,862)
  
  Financing activities:
    Principal payments on current debt                 (8,845)    (3,601)   (34,250)
    Proceeds from issuance of current debt              8,176        682      9,745
    Principal payments on long-term debt                 (506)    (4,717)      (778)
    Proceeds from issuance of 
      long-term debt                                      256        235      1,655
     Proceeds from stock option plans                   1,078      1,227        419
    Sale of common stock                                    -     53,991     43,827
      Net cash provided by 
      financing activities                                159     47,817     20,618
  
  Effect of exchange rate changes on cash                (509)      (574)       (33) 
  
  Net change in cash and cash equivalents               7,999      5,695      3,895 
  Cash and cash equivalents at 
    beginning of year                                  13,535      7,840      3,945 
  
  Cash and cash equivalents at end of year           $ 21,534   $ 13,535  $  7,840
</TABLE>  
  
  The accompanying notes are an integral part of these financial statements. 

/56
<PAGE>
  
<TABLE>
   Consolidated Statements of Stockholders' Equity                             Ionics, Incorporated
  

<CAPTION>
                                             Common Stock        Additional                Cumulative  Total
                                                       Par       Paid-in       Retained    Translation Stockholders' 
  Dollars in thousands                     Shares      Value     Capital       Earnings    Adjustments Equity
  <S>                                      <C>         <C>       <C>           <C>         <C>         <C>
  Balance December 31, 1990                4,172,020   $4,172    $ 26,421      $40,669     $ 4,352     $  75,614 
  Sale of common stock                     1,495,000    1,495      42,332            -           -        43,827 
  Stock options exercised                     41,349       41         189            -           -           230 
  Tax benefit of stock option activity             -        -         189            -           -           189 
  Translation adjustments, net of
       income taxes of $55                         -        -           -            -        (207)         (207) 
  Net income                                       -        -           -        8,278           -         8,278
  
  Balance December 31, 1991                5,708,369    5,708      69,131       48,947       4,145       127,931 
  Sale of common stock                     1,150,000    1,151      52,840            -           -        53,991 
  Stock options exercised                     50,144       50         497            -           -           547 
  Tax benefit of stock option activity             -        -         680            -           -           680 
  Translation adjustments, net of    
    income taxes of $746                           -        -           -            -      (5,629)       (5,629) 
  Net income                                       -        -           -        12,820          -        12,820
  
  Balance December 31, 1992                6,908,513    6,909     123,148       61,767      (1,484)      190,340 
  Stock options exercised                     37,292       37         465            -           -           502 
  Tax benefit of stock option activity             -        -         576            -           -           576 
  Translation adjustments, net of    
  income taxes of $1,165                           -        -           -            -      (5,144)       (5,144) 
  Net income                                       -        -           -       13,807           -        13,807
  Balance December 31, 1993                6,945,805   $6,946    $124,189      $75,574     $(6,628)     $200,081
  
  
  
</TABLE>  
  
  The accompanying notes are an integral part of these financial statements. 

/57
<PAGE>
  NOTE 1. SIGNIFICANT ACCOUNTING POLICIES 
  
  Principles of Consolidation 
  
      The consolidated financial statements include the accounts of the
  Company, its wholly and majority-owned subsidiaries and Aqua Cool
  Enterprises, Inc., a controlled affiliate. All significant intercompany
  accounts and transactions have been eliminated.
  
      Investments in affiliated companies, representing non-majority
  ownership interests, are accounted for under the equity method. 
  
  Revenue Recognition 
  
      Product revenues are recorded upon shipment, and service revenues are
  recorded as the services are performed. Interest revenues on consumer
  water equipment loans are recognized over the life of the loans.
  
      Most equipment leases to customers are accounted for as operating
  leases wherein rental revenues are recognized over the life of the lease
  and the cost of the equipment is depreciated over its useful life. Some
  leases are accounted for as sales-type leases wherein the present value of
  the lease revenues and costs are recognized at the time of shipment of the
  product.
  
      Revenues from large contracts are recognized using the percentage
  completion method of accounting in the proportion that costs incurred bear
  to total estimated costs at completion. Losses, if any, are provided for
  in the period in which the loss is determined.
  
      Interest earned on notes receivable, totaling $1,277,000, $1,643,000
  and $1,309,000 in 1993, 1992 and 1991, respectively, is included in
  revenues. 
  
  Cash Equivalents 
  
      Short-term investments with a maturity of 90 days or less from date of
  acquisition a reclassified as cash equivalents. 
  
  Inventories 
  
      Inventories are carried at the lower of cost or market, principally on
  the first-in, first-out basis. The Company had no deferred production
  costs which exceeded the aggregate estimated cost of long-term sales
  contracts. 
/58
<PAGE>
  
  Property, Plant and Equipment 
  
      Property, plant and equipment is recorded at cost. When an asset is
  retired or sold, any resulting gain or loss is included in the results of
  operations. Interest capitalized as property, plant and equipment a
  mounted to $177,000, $709,000 and $703,000 in 1993, 1992 and 1991,
  respectively. Depreciation is computed on a straight-line basis over the
  expected lives of the assets, as follows:
  
  Classification                                   Depreciation Lives 
  Buildings and improvements                             10-40 years
  Machinery and equipment, including    
    water supply equipment                                3-25 years 
  Other                                                   3-12 years
  
      The Company's policy is to depreciate desalination plants, other than
  leased equipment, over the shorter of their useful lives or the term of
  the corresponding water supply contracts. 
  
  Goodwill 
  
      Goodwill is included in other assets and represents the unamortized
  difference between acquisition cost and the fair value of net assets
  acquired in the purchase of various entities. Goodwill is amortized on a
  straight-line basis for up to 40 years. 
  
  Foreign Exchange 
  
      Assets and liabilities of foreign affiliates and subsidiaries are
  translated at year-end exchange rates, and the related statements of
  operations are translated at average exchange rates for the year.
  Translation gains and losses are accumulated net of income tax as a
  separate component of stockholdersU equity.
  
      Some transactions of the Company and its subsidiaries are made in
  currencies different from their own. Gains and losses from these
  transactions are included in income as they occur. Net foreign currency
  transaction gains included in income before taxes totaled $157,000,
  $587,000 and $180,000 for 1993, 1992 and 1991, respectively. 
  
  Income Taxes 
  
      Income tax expense is based on pretax financial accounting income.
  Deferred tax assets and liabilities are recognized for the expected tax
  consequences of temporary differences between the tax basis of assets and
  liabilities and their reported amounts. Earnings per Share Earnings per
  share is computed based on the weighted average number of common and
  common equivalent shares outstanding. Common equivalent shares result from
  the assumed exercise of dilutive stock options. Fully diluted earnings per
  share is substantially the same as earnings per share. 
/59
<PAGE>
  
  NOTE 2. CONSOLIDATED BALANCE SHEET DETAILS 
  
  Dollars in thousands                         1993         1992
      Raw materials                           $  9,541    $  7,949
      Work in process                            3,016       2,928
      Finished goods                             1,369       1,437
  
      Inventories                             $ 13,926    $ 12,314
  
      Land                                    $  1,261    $  1,279
      Buildings                                 13,829      13,752
      Machinery and equipment                  121,792     110,382
   Other, including furniture, fixtures 
      and vehicles                              18,918      13,348
                                               155,800     138,761
  
   Accumulated depreciation                    (55,355)    (40,960)
  
  Property, plant and equipment, net          $100,445    $ 97,801
  
  Goodwill                                    $ 25,660    $  4,849
  Accumulated amortization                      (1,608)     (1,252) 
  Other                                          5,200           -
  Other assets                                $ 29,252    $  3,597
  
  Obligation for purchase of RCC              $ 10,974    $      -
  
  Customer deposits                              5,668       4,288 
  Accrued commissions                            1,733       1,778 
  Accrued expenses                              13,957       9,994 
  Other current liabilities                   $ 32,332    $ 16,060 
  
  NOTE 3. SUPPLEMENTAL CASH FLOW INFORMATION 
  Dollars in thousands                        1993       1992       1991 
  
  Cash payments for interest and income taxes:
  
      Interest                                $   150   $  783    $3,320
      Taxes                                   $ 4,403   $7,374    $3,119
  
   Liabilities assumed in conjunction with 
   acquisitions and ACE preferred stock purchase:
      Fair value of assets consolidated       $47,825   $2,609
      Net cash paid                            (7,959)    (375)
      Liability associated with purchase of
       Resources Conservation Co. (net
       of cash acquired)                      (10,488)       -
  
  Liabilities assumed                         $29,378   $2,234
/60
<PAGE>
  
  NOTE 4. ACCOUNTS RECEIVABLE 
  
  Dollars in thousands                        1993      1992 
  
  Billed receivables                          $36,819   $29,068 
  Unbilled receivables                         21,715    16,208 
  Allowance for doubtful accounts              (1,320)   (1,636) 
  Accounts receivable                         $57,214   $43,640 
  
  Unbilled receivables represent the excess of revenues recognized on
  percentage of completion contracts over amounts billed. These amounts will
  become billable as the Company achieves contractual milestones.
  Substantially all of the unbilled amounts at December 31, 1993 are
  expected to be billed during 1994.
  
      Billed receivables include retainage amounts of $3,054,000 and
  $1,626,000 at December 31, 1993 and 1992, respectively. Substantially all
  retainage amounts are collectible within one year. 
  
  NOTE 5. INVESTMENTS IN AFFILIATED COMPANIES 
  
  The Company's investments in the following foreign affiliates are
  accounted for under the equity method. The principal business activities
  of these foreign affiliates involve the production, sale and distribution
  of bottled and treated water and the sale of equipment and replacement
  parts.
                                              Ownership
  Affiliate                                   Percentage 
  
  Aqua Cool Kuwait - Kuwait                   49% 
  Aqua Cool Saudi Arabia - Saudi Arabia       40%
  Jalal-Ionics, Ltd. - Bahrain                40%
  Watlington Waterworks Limited - Bermuda     23% 
  Yuasa-Ionics Co., Ltd. - Japan              50%
  
      The Company's percentage ownership interest in a foreign affiliate may
  vary from its interest in the earnings of such affiliate.
  
  Activity in investments in affiliated companies: 
  Dollars in thousands                        1993      1992      1991 
  
  Investments at beginning of year            $4,279    $ 4,008   $ 3,720
  Equity in earnings                             775      1,281     1,412
  Distributions received                        (134)    (1,058)   (1,211)
  Additional investment
      made during the year                         -         27        62
  
  Cumulative translation adjustments              69         21        25 
  
  Investments at end of year                  $4,989    $ 4,279   $ 4,008
  
      At December 31, 1993, the Company's equity in the total assets and in
  the total liabilities of its foreign affiliates was $10,480,000 and
  $5,491,000, respectively. The Company's equity in the 1993 total revenues
  of these affiliates was $9,094,000.
/61
<PAGE>

  
  Summarized data for foreign affiliates follows: 
  Dollars in thousands                        1993      1992      1991 
  
  Current assets                              $ 9,056   $ 8,622   $ 7,773
  Property and equipment, net                   8,169     7,848     5,262
  Current liabilities                           7,069     7,505     4,479
  Long-term debt                                  424       584       652
  Revenues                                     15,288    14,724    13,387
  Gross profit                                  6,701     6,929     6,312 
  Net income                                    1,364     2,076     1,981
  
  
  
   NOTE 6. CONTINGENT LIABILITIES 
  
      The Company is from time to time involved in litigation in the normal
  course of its business. None of these litigation matters is believed to be
  material to the financial position or business of the Company.
  
      Under the terms of a 1992 Settlement Agreement among the potentially
  responsible parties (PRPs), the Environmental Protection Agency (EPA) and
  the Commonwealth of Massachusetts, the Company paid $381,000 as a
  settlement amount to the Silresim Superfund Site settlement trust fund,
  representing the Company's approximately 1% volumetric contribution of
  wastes to the site. This fund, which contains in excess of $40 million,
  will be used by the EPA to clean up the Silresim Site in Lowell,
  Massachusetts. The amount paid by the Company had been fully reserved at
  December 31, 1991, and the payment had no material adverse impact on the
  Company. Because the pollution problems at the site have been extensively
  studied and because the funds collected from the settling PRPs by the site
  settlement trust fund substantially exceed the EPA's own estimate of
  remediation costs, the Company believes that it is unlikely that it will
  incur any further monetary obligations with respect to this site, other
  than site access costs that will be incurred by the EPA in connection with
  its remediation activities. The Company's share of these site access costs
  is expected to be $30,000 to $40,000 over the next several years. 
  
      The Company was notified in June, 1992 that it is a PRP at another
  Superfund site, Solvent Recovery Service of New England in Southington,
  Connecticut (the "SRS Site"). The EPA has not yet completed its remedial
  investigation or issued a record of decision specifying estimated clean-up
  costs, and therefore it is too early to determine what the Company's
  liability might be with respect to the SRS Site. However, based upon the
  very large number of PRPs identified (over 1,000), the Company's small
  volumetric ranking in comparison to the total volume of wastes (less than
  0.5%) and the identities of the larger PRPs, which include many
  substantial companies, the Company believes that its liability in this
  matter will not have a material effect on the Company or its financial
  position.
/62
<PAGE>
  
  NOTE 7. LONG-TERM DEBT AND NOTES PAYABLE 
  
  Dollars in thousands                        1993      1992 
  
  6 3/4% Industrial Revenue Bond 
      due 1994, in equal quarterly 
      installments                            $120      $360 
  9% mortgage note payable to bank due in 
      equal monthly installments                 -       198 
  Other credits                                162       422
                                               282       980 
  Less installments due within one year        173       541 
  
  Long-term debt and notes payable            $109      $439 
  
  The Industrial Revenue Bond is a limited obligation of the Industrial
  Development Financing Authority Board of the Town of Watertown,
  Massachusetts, guaranteed by the Company and collateralized by property,
  plant and equipment with a net book value of approximately $1,965,000 at
  December 31, 1993.
  
      Maturities of long-term debt and notes payable for the five years
  ending December 31, 1994 to 1998 are approximately $173,000, $22,000,
  $19,000, $8,000 and $7,000, respectively.
  
      The Company has domestic credit arrangements with various banks under
  which it can borrow up to an aggregate of approximately $35 million, at
  the prime rate or the London Interbank Offered Rate plus 1/2%, at the
  Company's option. There were no borrowings outstanding under these lines
  of credit at December 31, 1993 or 1992.
  
      The Company utilizes short-term bank loans to finance working capital
  requirements for certain business units. During 1993 and 1992, the
  weighted average amount of such borrowings was approximately $1,429,000
  and $1,290,000, respectively, and the maximum short-term borrowings under
  these arrangements in 1993 and 1992 were approximately $7,395,000 and
  $3,174,000, respectively. The Company's various loan and note agreements
  contain certain financial covenants typical to such agreements relating to
  working capital and to consolidated tangible net worth.
  
  NOTE 8. INCOME TAXES 
  
  Effective January 1, 1993, the Company changed its method of accounting
  for income taxes from the deferred method to the liability method required
  by Financial Accounting Standard No. 109 (FAS 109). As permitted under the
  new rule, prior years' financial statements have not been restated. The
  cumulative effect of adopting this Statement as of January 1, 1993 was
  immaterial to net income.
  
      The Company has elected not to provide tax on certain undistributed
  earnings of its foreign subsidiaries which it considers to be permanently
  reinvested. The cumulative amount of such unprovided taxes was
  approximately $369,000, $30,000 and $1,418,000 as of December 31, 1993,
  1992 and 1991, respectively. Reduced tax payments resulting from
  allocating tax benefits associated with the exercise of stock options
  directly to additional paid-in capital totaled $576,000, $680,000 and
  $189,000 in 1993, 1992 and 1991, respectively.
/63
<PAGE>
  
      The following is a summary of U.S. and non-U.S. income before income
  taxes and minority interest, the components of the provisions for income
  taxes and deferred income taxes and a reconciliation of the U.S. statutory
  income tax rate to the effective income tax rate.
  
  Income before income taxes and minority interest: 
  
  Dollars in thousands                        1993      1992      1991 
  
  U.S.                                        $10,902   $ 9,753   $ 5,867
  Non-U.S.                                      8,822     8,431     5,782
  Income before income taxes and 
      minority interest                       $19,724   $18,184   $11,649
  
  
  Income tax provisions (benefits) consist of the following: 
  
  Dollars in thousands                        1993      1992      1991
  
      Federal                                 $2,124    $2,121    $ 2,603
      Foreign                                  1,729     2,290        755
      State                                      475       300        475 
  
  Current provision                            4,328     4,711      3,833
  
      Federal                                    528      (441)    (1,061)
      Foreign                                  1,013       976        625
      State                                       48        27       (135)
  
  Deferred provision (benefit)                 1,589       562       (571) 
  Provision for income taxes                  $5,917    $5,273    $ 3,262
  
  Deferred tax provisions (benefits) consist of the following: 
  
  Dollars in thousands                        1993      1992      1991
  
  U.S. tax on unremitted earnings               
      (net of foreign tax credit )            $  335    $   -     $    -
  Use of installment method                        -        -       (744) 
  Use of different book/tax contract 
      accounting methods                         257      (94)    (1,090)
  Net reversal of deferred profit on   
      sales to foreign subsidiaries               71       44         33 
  Use of accelerated depreciation                651      672        970 
  DISC dividend                                 (197)    (197)      (197) 
  Bad debt reserve activity                       87      (76)       126 
  Other, net                                     385      213        331 
  Deferred tax provision (benefit)            $1,589    $ 562     $ (571) 
/64
<PAGE>
  
  The United States statutory corporate tax rate is reconciled to the
  Company's effective tax rate as follows:
  
                                              1993      1992      1991 
  
  U.S. Federal statutory rate                 34.0%     34.0%     34.0% 
  Foreign Sales Corporation                   (1.9)     (2.2)     (4.4) 
  Tax exempt interest income                  (3.5)     (3.7)        -
  Provision on undistributed 
      foreign earnings                           -       7.8         -
  Timing items completely reversed               -      (7.5)        -
  State income taxes,
      net of federal tax benefit               1.8       1.2       1.9 
  Foreign income taxed at different rates     (1.3)       .3      (3.8) 
  Other, net                                    .9       (.9 )      .3 
  Effective tax rate                          30.0%     29.0%     28.0% 
  
  Deferred income taxes reflect the net tax effects of temporary differences
  between the carrying amounts of assets and liabilities for financial
  reporting purposes and the amounts used for income tax purposes. At
  December 31, 1993 the temporary differences are:
  
                                              Deferred     Deferred tax 
  Dollars in thousands                        tax assets   liabilities 
  
  Depreciation                                $     -      $ 2,992 
  Inventory valuation                             257           -
  Unremitted earnings                               -          512 
  Bad debt reserves                               224            - 
  Sales to foreign subsidiaries                 1,150            -
  Insurance reserves                              234            -
  Pensions                                        298            -
  Sale versus lease                             1,186            -
  Foreign withholding taxes on
      undistributed earnings                        -        1,333
  Foreign deferred liabilities                      -        1,524
  Net operating loss carryforwards              6,340            -
  Miscellaneous                                 1,103        1,162
                                               10,792        7,523
  
  Valuation allowance for deferred
      tax assets                               (1,800)           -
  
  Deferred income taxes                       $ 8,992      $ 7,523
  
      At December 31, 1993, the Company had unused tax loss carryforward
  benefits of $6,340,000 (expiring in fiscal years 2004 to 2008). Because
  certain provisions of the tax law may limit the utilization of these
  benefits, the Company has established a $1,800,000 valuation allowance at
  December 31, 1993. The net unused tax loss carryforward benefit of
  $4,540,000 has been included in other assets. 
/65
<PAGE>
  
  NOTE 9. STOCKHOLDERS' EQUITY 
  
      The Company maintains two stock option plans. Under its 1979 Stock
  Option Plan (the "1979 Plan"), options may be granted to officers and
  other employees of the Company (either as non-qualified options or until
  February 15, 1989, as incentive stock options) and are exercisable at a
  price of not less than $1.00 per share. Any difference between the option
  price and the fair market value at the date of grant is charged to
  operations over the expected period of benefit to the Company. No
  additional shares of common stock were authorized for issuance as options
  during 1993. At December 31, 1993, 12,754 shares were reserved for
  issuance of additional options under the 1979 Plan.
  
      During 1992, an additional 70,000 shares of common stock were
  authorized for issuance as options under the 1986 Stock Option Plan for
  Non-Employee Directors (the "1986 Plan"). These options may be granted at
  a price not less than fair market value at the date of grant. No
  additional shares of common stock were authorized for issuance as options
  under the 1986 Plan during 1993. As of December 31, 1993, 67,000 shares
  were reserved for issuance of additional options under the 1986 Plan.
  
      The Company has also reserved 45,600 shares for options granted in
  1990 to certain non-employees in exchange for a previously granted option
  to purchase 50% of the shares of Osmomar S.A., a Spanish subsidiary of the
  Company which was merged with Ionics Iberica, S.A. in 1992.

<TABLE>  
      A summary of changes in the total amount of outstanding options for
  the three years ended December 31, 1993 follows:
<CAPTION>
  
                                               1993           1992           1991 
  <S>                                         <C>            <C>            <C> 
  Shares under option,
      beginning of year                       530,375        555,780        361,769
  Options granted                             350,250         31,750        245,500
  Options exercised                           (39,839)       (55,480)       (51,489)
  Options cancelled                            (8,000)        (1,675)             -
  Shares under option,
      end of year                             832,786        530,375        555,780
  Shares exercisable                          800,866        493,895        514,740
  
  Price range of 
      options granted                         $39.50-48.75   $ 1.00-60.75   $40.13-46.25
  Price range of 
      options exercised                       $ 1.00-54.00   $11.00-43.00   $ 1.00-24.50
   Price range of 
      options exercisable                     $ 1.00-60.75   $ 1.00-60.75   $ 1.00-46.25
  

      The Company also has a Section 401(k) stock savings plan under which 75,000 shares
  have been registered with the Securities and Exchange Commission for purchase on behalf
  of employees. Shares will normally be acquired for the plan in the open market. However,
  the Board of Directors has reserved an additional 60,000 shares for issuance by the
  Company from authorized but unissued shares if required. Through December 31, 1993, no
  shares had been issued under the plan.
</TABLE>
/66
<PAGE>
 
     The Company has adopted a Stockholder Rights Plan designed to protect 
stockholders against abusive takeover tactics. Rights were distributed as a 
dividend at the rate of one right for each share of the Company's stock. Each 
right entitles the holder to purchase from the Company one unit, consisting 
initially of one-fifth share of common stock and one note in principal amount 
equal to four-fifths of the current market price of the common stock on the 
date of exercise, at a purchase price of $50 subject to adjustment. In certain 
circumstances, rights cease to be exercisable for a unit and become 
exercisable for $100 worth of common stock (or a combination of cash, property 
or other securities of the Company) for $50.
  
     The rights are not exercisable until: (i) 10 days following a public 
announcement that a person or group has acquired 20 percent or more of the 
Company's common stock; or (ii) 10 business days following the commencement 
of a tender offer that could result in the person or group owning at least 
30 percent of the Company's stock; or (iii) immediately after a declaration 
by the Company's independent directors that a person is an "Adverse Person," 
as defined in the Rights Plan.
  
     Subject to possible extension, the rights may be redeemed by the Company 
at $.01 per right at any time until 10 days after a public announcement that 
20 percent or more of the Company's outstanding common stock has been acquired 
by a person or group. Unless redeemed earlier, the rights, which have no 
voting power, expire on December 31, 1997. 

  NOTE 10. OPERATING LEASES 
  
      The Company leases equipment, primarily triple-membrane trailers and 
bottled water coolers, to customers through operating leases. The original 
cost of this equipment was $37,555,000 and $27,657,000 at December 31, 1993 
and 1992, respectively. The accumulated depreciation for such equipment was 
$9,914,000 and $6,173,000 at December 31, 1993 and 1992, respectively.
  
     At December 31, 1993, future minimum rentals receivable under 
noncancelable operating leases in the years 1994 through 1998 and later were 
approximately $5,582,000, $5,019,000, $4,019,000, $3,329,000, $2,705,000 and 
$7,745,000, respectively. 
  
  NOTE 11. PROFIT SHARING AND PENSION PLANS 
  
     The Company has a contributory profit-sharing plan covering substantially 
all of the employees of its Bridgeville, Pennsylvania operations and certain 
related operations.  Company contributions are made from pre-tax profits and 
may vary from 8% to 15% of participants' compensation and are allocated to 
participantsU accounts in proportion to each participants' respective 
compensation. Company contributions were $381,000, $372,000 and $387,000 in 
1993, 1992 and 1991, respectively.
  
     The Company also has a contributory defined benefit pension plan for its 
Watertown-based employees as well as personnel at Ionics Pure Solutions in 
Arizona, Ionics Ultrapure Water Corporation in California and Resources 
Conservation Company in Washington. The benefits are based on years of service 
and the employee's average compensation.  The Company's funding policy is to 
contribute annually an amount that can be deducted for federal income tax 
purposes.
/67
<PAGE>
<TABLE>
      The following table sets forth the pension plan's funded status and amounts
  recognized in the Company's balance sheets at December 31, 1993 and 1992:
  
  Dollars in thousands                             1993       1992 
  <S>                                             <C>         <C>
  Actuarial present value of benefit obligations:
      Accumulated benefit obligation, 
      including vested benefits of 
      $6,447 and $5,734, respectively              $6,778     $5,957
      Projected benefit obligation for service 
      rendered to date                             $7,736     $6,678 
  
  Plan assets at fair value                         6,615      5,829 
  Projected benefit obligation in excess 
      of plan assets                                1,121        849 
  Unrecognized net loss                              (508)      (287) 
  Unrecognized prior service cost                    (120)      (130) 
  Unrecognized net assets being amortized 
      over approximately 17 years                     520        573 
  Accrued pension cost at December 31              $1,013     $1,005
</TABLE>
<TABLE>
  Net pension cost included the following components: 
<CAPTION>
  Dollars in thousands                             1993       1992          1991 
  <S>                                              <C>        <C>           <C>
  Service cost                                     $568       $482          $386 
  Interest cost                                     556        512           478 
  Return on plan assets                            (632)      (380)         (886) 
  Net amortization (deferral)                        50       (137)          416 
  Net periodic pension cost                        $542       $477          $394
  

    The discount rates used in determining the projected benefit obligation
 are 7.5% in 1993 and 8% in 1992. The rate of increase in compensation
 levels used is 6%. The expected long-term rate of return on assets was 9%.
 Plan assets consist primarily of money market, equity and fixed income
 securities and are administered by an independent trustee.
  
      The Company does not provide post-retirement health care to its employees or any
  other significant post-retirement benefits  other than those described above. 
  
  NOTE 12. FINANCIAL INSTRUMENTS 
  
  Off-Balance-Sheet Risk 
  
      The Company issues letters of credit as guarantees for various performance and bid
  obligations. Approximately $19.2 million and $5.2 million of these letters were
  outstanding at December 31, 1993 and 1992, respectively. Approximately 11% of the
  letters of credit outstanding at December 31, 1993 are scheduled to expire in 1994. The
  Company periodically enters into foreign exchange contracts to hedge certain operational
  and balance sheet exposures against changes in foreign currency exchange rates. Because
  the impact of movements in currency exchange rates on foreign exchange contracts offsets
  the related impact on the underlying items being hedged, these instruments do not
  subject the Company to risk that would otherwise result from changes in
  currency  exchange rates. The Company had no foreign exchange contracts
  outstanding at December 31, 1993 and 1992.
</TABLE>
/68
<PAGE>
  Concentrations of Credit Risk 
  
     Financial instruments that potentially subject the Company to significant
concentrations of credit risk consist principally of cash equivalents, 
investments, trade accounts receivable and notes receivable. The credit risk 
of cash equivalents and investments is low as the funds are primarily invested 
in U.S. government securities and with major financial institutions. The 
Company's concentrations of credit risk with respect to trade accounts 
receivable and notes receivable is considered low. The Company's customer base 
is spread across many different industries and geographies and the Company 
obtains guaranteed letters of credit for many of its foreign orders. 
  
  FAIR VALUE OF FINANCIAL INSTRUMENTS 
  
     The carrying amounts of cash equivalents and investments closely 
approximates their fair values as these items have relatively short maturities 
and are highly liquid. Based on market information, the carrying amounts of 
notes receivable and debt approximates their fair values. 

  INVESTMENTS IN SECURITIES 
  
     In May 1993, the Financial Accounting Standards Board issued Financial 
Accounting Standard No. 115, "Accounting for Certain Investments in Debt and 
Equity Securities," which requires the expanded use of fair value accounting 
for certain investments in debt and equity securities. The Statement is 
effective for fiscal years beginning after December 15, 1993. The impact of 
adoption on the Company's financial position is not expected to be material. 
  
  NOTE 13.  CONSOLIDATION AND ACQUISITION 
  
  AQUA COOL ENTERPRISES, INC. 
  
     Prior to May 26, 1993, Aqua Cool Enterprises, Inc. ("ACE") was an 
independently owned distributor of the Company's Aqua Cool bottled water 
products. The Company sold bottled water and related supplies to ACE; leased 
coolers and vehicles to ACE; and provided management services and operational 
support to ACE. In addition to equipment lease financing it received from the 
Company, ACE had received $12.5 million in debt and preferred equity financing 
from Westinghouse Credit Corporation ("Westinghouse") over a three- year 
period beginning in 1989.
  
     Effective May 26, 1993, the Company loaned $8.25 million to ACE with 
which ACE subsequently redeemed the outstanding senior note and preferred 
stock of ACE held by Westinghouse. On June 10, 1993, the Company exchanged 
its $8.25 million loan to ACE for ACE preferred stock. The Company holds an 
option to acquire the outstanding common stock of ACE for a nominal amount.
  
     As a result of these transactions, the Company has consolidated the 
operating results of ACE as if ACE were a wholly owned subsidiary. ACE's 
results of operations are included in the Company's consolidated financial 
statements from May 26, 1993. The combination has been accounted for under 
the purchase method with goodwill of $12.2 million, net of federal income 
tax benefits of $4.5 million, being amortized on a straight-line basis over 
40 years.
/69
<PAGE>
<TABLE>
    For purposes of presenting the following unaudited pro forma
 consolidated results all transactions between the Company and ACE have
 been eliminated as if the consolidation had occurred on January 1, 1992.
    The pro forma results also reflect adjustments that are attributable to
 the consolidation such as interest expense, goodwill amortization,
 operational efficiencies, asset revaluations and related tax effects.
    
<CAPTION>  
  Twelve Months Ended December 31 (unaudited)
                                                   1993       1992 
<S>                                               <C>        <C>
  Net revenues                                     $174,400   $155,569 
  Income before extraordinary items                $ 12,702   $ 10,401
  Net income                                       $ 12,702   $ 10,401
  Earnings per share                               $ 1.80     $ 1.50
  
    RESOURCES CONSERVATION COMPANY 
 
  Effective December 1, 1993, the Company acquired a substantial portion of the assets and
  liabilities of Resources Conservation Company (RCC) for approximately $10.9 million. RCC
  designs, engineers and installs wastewater treatment systems.
  
      The acquisition was accounted for under the purchase method with the results of RCC
  included from December 1, 1993. Goodwill of $8.3 million is being amortized on a
  straight-line basis over 40 years. Pro forma results of operations have not been
  presented as the effect of this acquisition on the financial statements was immaterial.
  Fiscal 1993 RCC revenues for the period prior to December 1, 1993 were approximately
  $25.3 million.
  
      Payment of the RCC purchase price of $10.9 million plus related interest expense of
  approximately $100,000 occurred on January 27, 1994. The obligation for payment plus
  related accrued interest was included in other current liabilities at December 31, 1993. 
  
  NOTE 14. SEGMENT INFORMATION 
  
  Business Segments The Company conducts its business in three business segments:
  
      Membranes and Related Equipment - electrodialysis reversal systems; reverse osmosis
  systems; microfiltration systems; conventional water and wastewater treatment equipment;
  other separations technology products; zero liquid discharge systems; instruments for
  monitoring and on-line detection of pollution levels; and fabricated products.
  
      Water and Chemical Supply - water and chemicals produced by the Company's membrane-
  based equipment, including desalted water for municipal and industrial use; ultrapure
  water for electronics and other industries; and bleach and related chemicals.
  
      Consumer Water Products - bottled water; over and under-the-sink point of use
  devices; carbon filtering media; and point-of-entry systems for treating the entire home
  water supply.
</TABLE>
/70
<PAGE>
<TABLE>
      A summary of the Company's operations by business segment follows on the next page:
  

<CAPTION>
                                          Membranes    Water and    Consumer   Corporate
                                         and Related    Chemical      Water        and  
  Dollars in thousands                    Equipment      Supply     Products      Other         Total
  <S>                                    <C>           <C>          <C>        <C>           <C>
  1993 
  Revenue - unaffiliated customers           $92,352     $51,513     $31,408       $  -      $175,273
  Intersegment transfers                       1,165         574           9     (1,748)           - 
  Income from operations                       4,850       8,629       4,679       (998)       17,160
  Equity income                                (195)         155         815          -           775
  Earnings before interest and taxes (EBIT)    4,655       8,784       5,494       (998)       17,935
  EBIT % of total EBIT                           26%         49%         31%        (6%)         100%
  Identifiable assets                         78,341      88,094      54,533      23,605      244,573
  Investments in affiliated companies            338       1,108       3,543          -         4,989
  Depreciation and amortization                2,159      10,431       2,662         211       15,463
  Capital expenditures                         2,605       9,470       2,092         500       14,667
  
  1992 
  Revenue - unaffiliated customers           $81,019     $46,698     $27,523       $  -      $155,240
  Intersegment transfers                       1,939         597           3     (2,539)          -  
  Income from operations                       7,540       7,585       1,013     (1,322)       14,816
  Equity income                                (185)         158       1,308          -         1,281
  Earnings before interest and taxes (EBIT)    7,355       7,743       2,321     (1,322)       16,097
  EBIT % of total EBIT                           46%         48%         14%        (8%)         100%
  Identifiable assets                         55,833      92,906      35,377      36,195      220,311
  Investments in affiliated companies            463         981       2,835          -         4,279
  Depreciation and amortization                1,957       8,212       2,113         306       12,588
  Capital expenditures                         1,548      19,467       3,069         614       24,698
  
  1991 
  Revenue - unaffiliated customers           $76,267     $31,491     $30,362       $  -      $138,120
  Intersegment transfers                       1,231         780          -      (2,011)           - 
  Income from operations                       4,653       5,022       1,699     (1,192)       10,182
  Equity income                                 (19)         116       1,315          -         1,412
  Earnings before interest and taxes (EBIT)    4,634       5,138       3,014     (1,192)       11,594
  EBIT % of total EBIT                           40%         44%         26%       (10%)         100%
  Identifiable assets                         53,628      86,891      32,572         880      173,971
  Investments in affiliated companies            628         829       2,551          -         4,008
  Depreciation and amortization                1,968       3,758       2,483         321        8,530
  Capital expenditures                         1,802      30,797       2,006         257       34,862
  
</TABLE>


/71

<PAGE>
<TABLE>
  Geographic Segments 
  
  Sales are reflected in the segment from which the sales are made. Transfers between
  areas are generally made at cost plus a markup which approximates prices charged to
  unaffiliated customers. Certain corporate expenses are included with the  elimination of
  intersegment profit in the "Corporate and Eliminations" segment. Identifiable corporate
  assets, which are net of eliminations, consist primarily of cash and short-term
  investments. Information about the Company's operations by geographic  segment follows:
  

<CAPTION>                                                                                        Corporate
                                                       United                      Other         and 
  Dollars in thousands                                 States        Europe        International Eliminations  Total 
  <S>                                                  <C>           <C>           <C>           <C>           <C> 
  1993 
  Revenue - unaffiliated customers                     $123,599      $42,571       $ 9,103       $      -      $175,273
  Intersegment transfers                                  9,375          420         2,824        (12,619)            - 
  Income from operations                                 10,968        5,417           985           (210)       17,160
  Identifiable assets                                   171,483       42,041        11,771         19,278       244,573 
  1992 Revenue - unaffiliated customers                $102,498      $41,992       $10,750       $      -      $155,240
  Intersegment transfers                                  7,033          223         1,731         (8,987)            - 
  Income from operations                                  8,852        6,546           907         (1,489)       14,816
  Identifiable assets                                   137,562       41,580        10,387         30,782       220,311 
  1991 
  Revenue Q unaffiliated customers                     $ 85,427      $40,754       $11,939       $      -      $138,120 
  Intersegment transfers                                  8,581        1,342         2,049        (11,972)            - 
  Income from operations                                  5,234        4,910           947           (909)       10,182
  Identifiable assets                                   113,237       55,383        10,066         (4,715)      173,971 
  
  Included in the United States segment are export  sales of approximately 22%, 27% and 26% for 1993, 1992 and 1991,
  respectively. Including these U.S. export sales, the percent ages of total revenues attributable to activities outside
  the U.S. were 45%, 52% and 54% in 1993, 1992 and 1991, respectively.
  
</TABLE>

/72

<PAGE>
  Report of Independent Accountants
  
  To the Board of Directors and Stockholders of Ionics, Incorporated: 
  
  We have audited the consolidated balance sheets of Ionics, Incorporated at 
December 31, 1993 and 1992 and the related consolidated statements of 
operations, cash flows and stockholders' equity for each of the three years 
in the period ended December 31, 1993. These financial statements are the 
responsibility of the Company's management. Our responsibility is to express 
an opinion on these financial statements based on our audits.
  
  We conducted our audits in accordance with generally accepted auditing 
standards. Those standards require that we plan and perform the audit to 
obtain reasonable assurance about whether the financial statements are free 
of material misstatement. An audit includes examining, on a test basis, 
evidence supporting the amounts and disclosures in the financial statements. 
An audit also includes assessing the accounting principles used and 
significant estimates made by management, as well as evaluating the overall 
financial statement presentation. We believe that our audits provide
a reasonable basis for our opinion.
  
  In our opinion, the financial statements referred to above present fairly, 
in all material respects, the consolidated financial position of Ionics, 
Incorporated as of December 31, 1993 and 1992, and the consolidated results 
of its operations and its cash flows for each of the three years in the 
period ended December 31, 1993, in conformity with generally accepted 
accounting principles.
  
  
  Boston, Massachusetts February 22, 1994
  
/73

<PAGE>
<TABLE>  
  Selected Financial Data                              Ionics, Incorporated
  
  
  
  Statement of Operations Data 
  Dollars in thousands, except 
  per share amounts                1993      %         1992      %         1991      %         1990      %         1989         % 
  <S>                              <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>
  Revenues                         $175,273  100.0     $155,240  100.0     $138,120  100.0     $128,408  100.0     $108,915  100.0
  Income before income taxes         19,724   11.3       18,184   11.7       11,649    8.4        6,442    5.0        5,310    4.9
  Net income                         13,807    7.9       12,820    8.3        8,278    6.0        4,727    3.7        3,590    3.3
  EarnEarnings per share               1.96                1.85                1.45                1.10                 .85       
</TABLE>  
  
<TABLE>
<CAPTION> 
  Balance Sheet Data 
  Dollars in thousands             1993      1992      1991      1990      1989 
  <S>                              <C>       <C>       <C>       <C>       <C>      
  Current assets                   $109,957  $108,757  $ 72,334  $ 66,572  $ 67,018 
  Current liabilities                46,082    30,499    36,528    51,716    44,833 
  Working capital                    63,875    78,258    35,806    14,856    22,185 
  Total assets                      249,562   224,590   177,979   143,759   134,874 
  Long-term debt and notes payable      109       439     5,579     8,027    14,419 
  Stockholders' equity              200,081   190,340   127,931    75,614    68,102
</TABLE>  

<TABLE>

<CAPTION>  
  Selected Quarterly Financial Data (unaudited) 
  Dollars in thousands,                                          Earnings                                                   Earnings
  except per                                 Gross     Net       per                                     Gross     Net      per
  share amounts                    Revenues  Profit    Income    Share                         Revenues  Profit    Income   Share 
  1993                                                                     1992 
  <S>                              <C>       <C>       <C>       <C>       <C>                 <C>       <C>       <C>      <C>
  First Quarter                    $ 41,158  $13,911   $ 3,364     .48     First Quarter       $ 36,248  $13,182   $ 2,607  $  .40
  Second Quarter                     45,618   15,080     3,520     .50     Second Quarter        40,063   14,183     3,183     .45 
  Third Quarter                      42,791   14,314     3,516     .50     Third Quarter         37,111   13,620     3,372     .48
  Fourth Quarter                     45,706   14,965     3,407     .48     Fourth Quarter        41,818   14,324     3,658     .52
                                   $175,273  $58,270   $13,807   $1.96                         $155,240  $55,309   $12,820   $1.85
</TABLE>  
<TABLE>
 <CAPTION>
  Common Stock Price Range         High      Low                 High      Low 
  1993                                                                               1992 
  <S>                              <C>       <C>       <C>                 <C>       <C>
  First Quarter                    $67 7/8   $53 1/2   First Quarter       $67 1/2   $42 1/4 
  Second Quarter                   $56 3/8   $39       Second Quarter      $59 7/8   $51 
  Third Quarter                    $50       $38 1/2   Third Quarter       $57 1/2   $50 
  Fourth Quarter                   $52 3/8   $46 3/4   Fourth Quarter      $68 1/2   $51 3/4

</TABLE>
/74

<PAGE>
         Board of Directors
         
         ARTHUR L. GOLDSTEIN u
         Chairman of the Board,
         President and Chief 
         Executive Officer
         Ionics, Incorporated
         
         WILLIAM L. BROWN s n 
         Retired Chairman of the 
         Board, The First National 
         Bank of Boston
         
         ARNAUD DE VITRY D'AVAUCOURT s n 
         Engineering Consultant 
         and Director of Various 
         Organizations
         
         LAWRENCE E. FOURAKER u s n 
         Trustee and Director of 
         Various Organizations
         
         SAMUEL A. GOLDBLITH u s n  
         Professor Emeritus
         Massachusetts Institute
         of Technology, and
         Consultant
         
         K. KACHADURIAN
         Senior Vice President
         Ionics, Incorporated
         
         WILLIAM E. KATZ    
         Executive Vice President 
         Ionics, Incorporated
         
         ROBERT B. LUICK   
         Of Counsel, Sullivan and 
         Worcester, Attorneys
         
         JOHN J. SHIELDS s n 
         President and Chief
         Executive Officer
         King's Point
         Holdings Incorporated
         
         MARK S. WRIGHTON 
         Provost and Professor of Chemistry, 
         Massachusetts Institute of Technology
         
/75

<PAGE>         
         
         ALLEN S. WYETT s n
         President, Wyett 
         Consulting Group, Inc.
         
         
         
         u    Member of Executive 
              Committee
         s    Member of Audit
              Committee
         n    Member of Compensation
              Committee
         
         
         
         
         











































/76

<PAGE>
         
         
         Corporate Officers
         
         ARTHUR L. GOLDSTEIN
         Chairman of the Board,
         President and Chief
         Executive Officer
         
         WILLIAM E. KATZ
         Executive Vice President
         
         K. KACHADURIAN      
         Senior Vice President
         
         ROBERT J. HALLIDAY    
         Vice President     
         Finance and Accounting 
         and Chief Financial 
         Officer
         
         STEPHEN KORN          
         Vice President, General 
         Counsel and Clerk
         
         THEODORE G. PAPASTAVROS 
         Vice President    
         Strategic Planning      
         and Treasurer
         
         
         
         
         
         
         
         
         
























/77
         
         
<PAGE>         
         Principal Offices, 
         Affiliates &
         Subsidiaries
         
         Ionics, Incorporated 
         Bridgeville, Pennsylvania
         
         General Ionics      
         Cuyahoga Falls, Ohio
         
         Ionics Pure Solutions 
         Phoenix, Arizona
         
         Elite Chemicals N.E.,
         Springfield, Massachusetts
         
         Ionics Ultrapure Water Corp. 
         Campbell, California
         
         Resources Conservation Co.
         Bellevue, Washington
         
         Resources Conservation Co. International
         Bellevue, Washington
         
         Ionics Italba, S.p.A. 
         Milan, Italy
         
         Ionics Iberica, S.A. 
         Grand Canary, Spain
         
         Ionics Nederland, B.V.
         Maastricht, the Netherlands
         
         Ionics 
         (UK) Ltd.    
         London, England
         
         Global Water Services,  S.A.
         Panama City, Panama
         
         Ionics, Incorporated    
         Hong Kong
         
         Ionics (Bermuda) Ltd. 
         Hamilton, Bermuda
         
         Elite Chemicals Pty. Ltd. 
         Brisbane, Qld. Australia
         
         












/78

<PAGE>
         
         Eau et Industrie       
         Paris, France
         
         Watlington Waterworks Ltd. 
         Devonshire, Bermuda
         
         Jalal-Ionics, Ltd.   
         Manama, Bahrain
         
         Aqua Cool Saudi Arabia 
         Dammam, Saudi Arabia
         
         Aqua Cool Kuwait    
         Kuwait City, Kuwait
         
         Aqua Cool Enterprises, Inc.
         Watertown, Massachusetts
         
         Yuasa-Ionics Co., Ltd. 
         Tokyo, 
         Japan
         Corporate Headquarters
         
         Ionics, Incorporated 
         Watertown, Massachusetts
         
         
         Investor Information
         
         The Annual Meeting of Ionics'
         shareholders will be held 
         Thursday, May 5, 1994 at 
         2:00 P.M. at Bank of Boston 
         100 Federal Street, 
         Boston, Massachusetts
         
         
         Ionics' common stock is traded 
         on the New York Stock Exchange under 
         the symbol ION.  As of March 18, 1994 
         there were approximately 
         1,800 shareholders of record.  No cash 
         dividends were paid in either 1993 or 
         1992 pursuant to Ionics' current policy to
         retain earnings for use in its business.
         
         For information or assistance 
         regarding individual stock 
         records, transactions or 
         certificates, please call the 
         Transfer Agent's Telephone 
         Response Center: (617)575-2900 between 8 A.M. and 7 P.M.
         

















/79
<PAGE>
         
         
         A copy of Ionics' Annual 
         Report on Form 10-K, which
         is filed with the Securities and 
         Exchange Commission, will be 
         sent to any shareholder upon 
         request directed to Investor 
         Relations, Ionics, Incorporated, 
         P.O. Box 9131,  Watertown, Massachusetts  
         02272-9131, 
         or by calling (617)926-2510 
         ext. 874.
         
         
         TRANSFER AGENT 
         & REGISTRAR
         The First National Bank of 
         Boston, Boston, Massachusetts
         
         
         AUDITORS
         Coopers & Lybrand        
         Boston, Massachusetts
         





































/80





                                 EXHIBIT 22
                            IONICS, INCORPORATED

                       SUBSIDIARIES OF THE REGISTRANT

                                                 




                                             State or Other Jurisdiction
        Name                                       of Incorporation     


Ionics Foreign Sales Corporation Limited            Jamaica

Global Water Services, S.A.                         Panama

Ionics Italba, S.p.A.                               Italy

Ionics Iberica, S.A.                                Spain

Ionics Nederland B.V.                               The Netherlands

Ionics Ultrapure Water Corporation                  California

Ionics Securities Corporation                       Massachusetts

Ionics (U.K.) Limited                               United Kingdom

Ionics (Bermuda) Ltd.                               Bermuda

Elite Chemicals Pty. Ltd.                           Australia

Eau et Industrie                                    France

Resources Conservation Co. International            Delaware

















/81








                              EXHIBIT 24.1
                   CONSENT OF INDEPENDENT ACCOUNTANTS




    We consent to the incorporation by reference in the registration
statements for the Ionics 1979 Stock Option Plan on Form S-8 (Registration
Nos. 33-41598, 33-5814, 33-14194, 2-64255, 2-72936 and 2-82780; in the
registration statement for the Ionics Section 401(k) Stock Savings Plan on
Form S-8 (Registration No. 33-2092); and in the Registration Statement for
the Ionics 1986 Stock Option Plan for Non-Employee Directors (Registration
No. 33-54400), of our reports dated February 22, 1994, on our audits of
the consolidated financial statements and the financial statement
schedules of Ionics, Incorporated as of December 31, 1993 and 1992 and for
each of the three years in the period ended December 31, 1993, which are
included or incorporated by reference in this Annual Report on Form 10-K.




                                             COOPERS & LYBRAND



Boston, Massachusetts
March 28, 1994

























/82







                             EXHIBIT 25

                          POWER OF ATTORNEY

    We, the undersigned officers and directors of Ionics, Incorporated (the
"Company"), hereby severally constitute Arthur L. Goldstein and Stephen
Korn, and each of them, to sign for us, and in our names in the capacities
indicated below, the Annual Report on Form 10-K of the Company for the
fiscal year ended December 31, 1993, and any and all amendments to such
Annual Report, hereby ratifying and confirming our signatures as they may be
signed by our attorneys to such Annual Report and any and all amendments
thereto.

    Witness our hands on the respective dates set forth below.

     Signature                      Title                    Date


/s/William L. Brown                 Director               March 28, 1994 
William L. Brown

/s/Arnaud de Vitry d'Avaucourt      Director               March 28, 1994 
Arnaud de Vitry
   d'Avaucourt

/s/Lawrence E. Fouraker             Director               March 28, 1994 
Lawrence E. Fouraker

/s/Samuel A. Goldblith              Director               March 28, 1994 
Samuel A. Goldblith

/s/Arthur L. Goldstein              Chairman of the Board  March 28, 1994 
Arthur L. Goldstein                 of Directors, Chief
                                    Executive Officer and  
                                    President (Principal
                                    Executive Officer)

/s/Kachig Kachadurian               Director               March 28, 1994 
Kachig Kachadurian

/s/William E. Katz                  Director               March 28, 1994 
William E. Katz

                                    Director                              
Robert B. Luick

                                    Director                              
John J. Shields

/s/Mark S. Wrighton                 Director               March 28, 1994 
Mark S. Wrighton

/s/Allen S. Wyett                   Director               March 28, 1994 
Allen S. Wyett

/83




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