IONICS INC
S-8 POS, 2000-06-20
SPECIAL INDUSTRY MACHINERY, NEC
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        As filed with the Securities and Exhange Commission on June 20, 2000
                                                   Registration No. 33-54400

                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                        POST-EFFECTIVE AMENDMENT NO. 3 TO

                                    FORM S-8

                             REGISTRATION STATEMENT

                                      Under

                            THE SECURITIES ACT OF 1933
                    Containing a Reoffer Prospectus on Form S-3

                              IONICS, INCORPORATED

                 (Exact name of registrant as specified in its charter)

       Massachusetts                                  04-2068530
(State or other jurisdiction of            (IRS Employer Identification No.)
 incorporation or organization)


65 Grove Street, Watertown, Massachusetts             02472
(Address of principal executive offices)            (Zip Code)

                             1986 STOCK OPTION PLAN
                           FOR NON-EMPLOYEE DIRECTORS
                            (full title of the plan)

                                  STEPHEN KORN
                       Vice President and General Counsel
                              Ionics, Incorporated
                                 65 Grove Street
                               Watertown, MA 02472
                                  617-926-2500
 (Name, address including zip code and telephone number, including area code,
                              of agent for service)

Approximate  date of  commencement  of proposed  sale to the public:  As soon as
practicable after this Registration Statement becomes effective.

If the only securities  being registered on this form are being offered pursuant
to dividend or interest reinvestment plans, please check the following box.

If any securities being registered on this form are to be offered on a delayed
or continuous basis pursuant to Rule 415 under the Securities Act of 1933, check
the following box.     X
                     -----


                                                                             -1-


<PAGE>


                                EXPLANATORY NOTE

This   Registration   Statement  has  been  prepared  in  accordance   with  the
requirements  of Form S-8 and relates to the  Registrant's  Common Stock offered
pursuant to the Registrant's 1986 Stock Option Plan for Non-Employee  Directors.
A total of 100,000  shares of Common  Stock were  registered  with the filing of
Form S-8 on November 12, 1992.  Pursuant to Rule 416 under the Securities Act of
1933,  as amended,  such filing also  covered an  additional  100,000  shares of
Common Stock  issuable  under such Plan as a result of a 2-for-1  stock split by
way of 100% stock  dividend  distributed on January 6, 1995. The purpose of this
Amendment  No. 3 is to  update a  Prospectus  prepared  in  accordance  with the
requirements  of Part I of Form S-3 which  relates  to the  reoffer or resale by
certain Selling  Stockholders of certain shares of the Registrant's Common Stock
covered by the Prospectus  prepared in accordance with the  requirements of Form
S-8.

                                                                             -2-


<PAGE>


                               REOFFER PROSPECTUS

                              IONICS, INCORPORATED

                                  91,000 Shares

                                  Common Stock

                            $1.00 par value per share

This Prospectus relates to the offer and sale of 91,000 shares (the "Shares") of
common  stock,  $1.00 par  value per share  (the  "Common  Stock"),  of  Ionics,
Incorporated  (the "Company" or "Ionics")  which may be offered hereby from time
to time by the selling  stockholders  named herein (the "Selling  Stockholders")
for their own benefit. The Company will not receive any of the proceeds from the
sale of the Shares of Common Stock by the Selling Stockholders.

The Company's Common Stock is listed on the New York Stock Exchange (NYSE) under
the symbol "ION." On June 19, 2000, the Closing price of the Common Stock on the
NYSE was $28 7/8.

THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE  COMMISSION OR ANY STATE  SECURITIES  COMMISSION NOR HAS THE SECURITIES
AND  EXCHANGE  COMMISSION  OR ANY STATE  SECURITIES  COMMISSION  PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

No  person  has  been  authorized  to  give  any  information  or  to  make  any
representation  other than those contained in this Prospectus in connection with
the  offering  made  hereby,   and  if  given  or  made,  such   information  or
representation  must not be relied upon as having been authorized by the Company
or by any other  person.  Neither the delivery of this  Prospectus  nor any sale
made hereunder  shall,  under any  circumstances,  create any  implication  that
information herein is correct as of any time subsequent to the date hereof. This
Prospectus  does not constitute an offer to sell or a solicitation  of any offer
to buy any security other than the securities  covered by this  Prospectus,  nor
does it constitute an offer to or solicitation of any person in any jurisdiction
in which such offer or solicitation may not be lawfully made.

                  The date of this Prospectus is June 20, 2000


                                                                             -3-


<PAGE>


                              AVAILABLE INFORMATION

The  Company is  subject to the  informational  requirements  of the  Securities
Exchange  Act of 1934,  as amended  (the  "Exchange  Act"),  and, in  accordance
therewith,  files  reports,  proxy  statements  and other  information  with the
Securities  and Exchange  Commission  (the  "Commission").  Such reports,  proxy
statements and other information are available for inspection and copying at the
public  reference  facilities  maintained by the Commission at 450 Fifth Street,
NW, Room 1024,  Washington,  D.C.  20549.  Copies of such  material  can also be
obtained  from the Public  Reference  Section of the  Commission  at  prescribed
rates. You may call the Commission at 1-800-SEC-0330 for further  information on
the Public Reference Room.

In  addition,  the  Commission  maintains  a  website  (http://ww.sec.gov)  that
contains  reports,  proxy  and  information  statements  and  other  information
regarding registrants that file electronically with the Commission.

The Company  will provide  without  charge to each person to whom a copy of this
Prospectus is delivered,  upon written or oral request, a copy of any and all of
the information  that has been  incorporated by reference in this Prospectus and
any registration  statement  containing this Prospectus  (other than exhibits to
those documents unless those exhibits are specifically incorporated by reference
into those  documents).  Such requests  should be made to Stephen  Korn,  Clerk,
Ionics,   Incorporated,   65  Grove  Street,   Watertown,   Massachusetts  02472
(telephone: 617-926-2500).

                                       -2-

                                                                             -4-


<PAGE>


                                   THE COMPANY

         Ionics 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.  Our products and services are used by us
or our 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 process food products,  recycle and
reclaim  process  water and  wastewater,  and to  measure  levels of  waterborne
contaminants  and  pollutants.   Our  customers  include  industrial  companies,
consumers, municipalities and other governmental entities, and utilities.

         Over fifty 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 a number of
membrane and  non-membrane-based  separations processes which the Company refers
to as The Ionics Toolbox(R). These separations processes include electrodialysis
reversal (EDR),  reverse  osmosis (RO),  ultrafiltration  (UF),  microfiltration
(MF),  electrodeionization (EDI), electrolysis, ion exchange, carbon adsorption,
and  thermal  processes  such as  evaporation  and  crystallization,  as well as
solvent  extraction and recovery  processes.  We believe that we are the world's
leading manufacturer of ion-exchange membranes and of membrane-based systems for
the desalination of water.

         We were incorporated in Massachusetts in 1948. Our principal  executive
offices are located at 65 Grove Street, Watertown, Massachusetts 02472.

         This   prospectus   contains   certain   "forward-looking   statements"
(statements  that are not  historical  fact) based on our current  expectations,
assumptions, estimates and projections about our Company and our industry. These
forward-looking  statements involve risks and uncertainties.  Our actual results
could  differ  materially  from  those  anticipated  in  those   forward-looking
statements as a result of many factors,  as more fully  described in our filings
with the Securities and Exchange Commission.

                                 USE OF PROCEEDS

The Company will not receive any of the proceeds  from the sale of the Shares of
Common Stock by the Selling Stockholders.  See "Selling  Stockholders" and "Plan
of Distribution."

                              SELLING STOCKHOLDERS

This Prospectus  relates to possible sales by certain  stockholders who are also
non-employee  directors of the Company of Shares issued pursuant to the exercise
of options  granted to such  stockholders  under the Company's 1986 Stock Option
Plan for Non-Employee Directors.

The  following  table  shows the name of each of the Selling  Stockholders,  the
number of outstanding  Shares of Common Stock of the Company  beneficially owned
by such person as of May 31, 2000, and the number of Shares available for resale
hereunder. Because the Selling Stockholders may sell all or part of their Shares
pursuant to this Prospectus, no estimate can be given as to the amount of Shares
that will be held by each of them upon termination of this offering.

                                       -3-

                                                                             -5-
<PAGE>

                                  Number of Shares            Number of Shares
                                  Available                   Covered
                                  Beneficially                by this
Name                              Owned (1) (2)               Prospectus
----                              -----------------           -----------------

Douglas R. Brown                     18,444 (3)                     8,000
William L. Brown                     18,782 (4)                    15,000
Arnaud de Vitry d'Avaucourt          33,500 (5)                    11,500
Kathleen F. Feldstein                 5,443 (6)                     4,000
John J. Shields                      12,243 (7)                    11,500
Carl S. Sloane                       10,000 (8)                     9,000
Daniel I. C. Wang                     6,943 (9)                     6,000
Mark S. Wrighton                     12,043 (10)                   11,000
Allen C. Wyett                       17,000 (11)                   15,000

(1)  The number of shares of Common Stock deemed  outstanding  as of the date of
     this  prospectus  for each  individual  includes  shares  of  Common  Stock
     outstanding on such date owned by such  individual and all shares of Common
     Stock subject to stock options held by such  individual  exercisable  as of
     the date of this prospectus or within 60 days thereafter.

(2)  Less than 1% of the Company's outstanding Common Stock

(3)  Includes  8,000 shares which Mr. Douglas R. Brown has the right to
     acquire  pursuant to the exercise of stock  options.

(4)  Includes  15,000 shares which Mr. William L. Brown has the right to acquire
     pursuant to the exercise of stock options.

(5)  Includes  11,500 shares which Mr. de Vitry d'Avaucourt  has the right to
     acquire pursuant to the exercise of stock options. Another 12,000 shares,
     as to which Mr. de Vitry d'Avaucourt shares dispositive  power,  are held
     by a financial institution in a fiduciary capacity for the benefit of Mr.
     de Vitry d'Avaucourt's wife.  Such number excludes 341,926 shares held in a
     trust of which Mr. de Vitry d'Avaucourt's wife is the principal beneficial
     owner, and also excludes an additional 524,000 shares held in a separate
     trust, of which Mr. de Vitry d'Avaucourt is the principal indirect
     beneficiary.  Mr. de Vitry d'Avaucourt disclaims beneficial  ownership of
     such 865,926 shares.

(6)  Included 4,000 shares which Ms. Feldstein has the right to acquire pursuant
     to the exercise of stock options.

(7)  Includes 11,500 shares which Mr. Shields has the right to acquire  pursuant
     to the exercise of stock options.

(8)  Includes 9,000 shares which Mr. Sloane has the right to acquire pursuant to
     the exercise of stock options.

                                       -4-

                                                                             -6-


<PAGE>


(9)  Includes 6,000 shares which Mr. Wang has the right to acquire pursuant to
     the exercise of stock options.

(10) Includes 11,000 shares which Mr. Wrighton has the right to acquire pursuant
     to the exercise of stock options.

(11) Includes 11,000 shares which Mr. Wyett has the right to acquire pursuant to
     the  exercise of stock  options.  Does not include  1,000  shares held by a
     member of Mr. Wyett's  immediate  family,  as to which Mr. Wyett  disclaims
     beneficial ownership.

                              PLAN OF DISTRIBUTION

The shares of our common stock  offered  hereby may be sold from time to time by
the selling  stockholders,  each for his or her own account,  subject to certain
restrictions.  Ionics will receive no proceeds from this  offering.  The selling
stockholders  will pay or assume  brokerage  commissions  or other  charges  and
expenses incurred in the sale of the shares.

The selling  stockholders'  sale of their shares is not currently subject to any
underwriting agreement. The shares covered by this prospectus may be sold by the
selling stockholders or by pledgees, donees, transferees,  distributees or other
successors  in  interest  of the  selling  stockholders  from time to time.  The
selling  stockholders  may sell their  shares from time to time at fixed  prices
that may be changed,  at market prices prevailing at the time of sale, at prices
related  to  prevailing  market  prices or at  negotiated  prices.  Sales may be
effected in the over-the-counter  market, on the New York Stock Exchange,  or on
any  exchange on which the shares may then be listed.  The selling  stockholders
may sell the  shares by one or more of the  following:  (a) in one or more block
trades  in which a broker or dealer so  engaged  will  attempt  to sell all or a
portion of the shares held by the selling stockholders as agent but may position
and resell a portion of the block as principal to  facilitate  the  transaction;
(b)  through  purchases  by a broker or dealer as  principal  and resale by such
broker or dealer for its account  pursuant to this  prospectus;  (c) in ordinary
brokerage transactions and transactions in which the broker solicits purchasers;
(d) in negotiated transactions; and (e) through other means.

The selling  stockholders may effect these  transactions by selling shares to or
through broker-dealers, and those broker-dealers may receive compensation in the
form of  underwriting  discounts,  concessions,  commissions,  or fees  from the
selling   stockholders   and/or   purchasers   of  the   shares  for  whom  such
broker-dealers  may act as agent or to whom they may sell as principal,  or both
(which  compensation  to a  particular  broker-dealer  might  be  in  excess  of
customary commissions). These broker-dealers and the selling stockholders may be
deemed to be  "underwriters"  within  the  meaning  of the  Securities  Act,  in
connection with those sales, and any commissions received by them and any profit
on the  resale of  shares  placed  by them  might be  deemed to be  underwriting
compensation.

Any shares of our common stock covered by this  Prospectus that qualify for sale
pursuant to Rule 144 under the  Securities Act may be sold under Rule 144 rather
than pursuant to this Prospectus. The selling stockholders are not restricted as
to the price or prices at which they may sell their  shares.  Sales of shares of
common stock at less than the market prices may depress the

                                       -5-

                                                                             -7-


<PAGE>


market price of our common stock. The selling  stockholders are restricted as to
the number of shares which may be sold at any one time  pursuant to Rule 144. In
addition, the selling stockholders may decide not to sell all, a portion, or any
of their shares.

We have informed the selling stockholders that the anti-manipulation rules under
the Exchange Act (including,  without limitation,  Rule 10b-5 and Regulation M -
Rule 102) may  apply to sales in the  market  and we will  furnish  the  selling
stockholders  upon request  with a copy of these Rules.  We will also inform the
selling stockholders of the need for delivery of copies of this prospectus.

State  Street Bank and Trust  Company,  Boston,  Massachusetts,  is the transfer
agent for our common stock.

                                  LEGAL MATTERS

The  validity of the shares of Common Stock  offered  hereby will be passed upon
for the Registrant by Stephen Korn,  Esq., Vice President and General Counsel of
the Company.  Mr. Korn is the beneficial owner of 90,086 shares of Common Stock,
including  88,000  shares of Common Stock in the form of  presently  exercisable
stock  options and 863 shares held in the Ionics  Section  401(k) Stock  Savings
Plan (based on January 31, 2000 data).

                INCORPORATION OF CERTAIN INFORMATION BY REFERENCE

The following  documents filed with the Commission are incorporated by reference
in this Prospectus:

(a) The Annual  Report of the  Company  on Form 10-K for the  fiscal  year ended
December 31, 1999 filed  pursuant to the  Securities  Exchange  Act of 1934,  as
amended,  which contains audited financial  statements for the fiscal year ended
December 31, 1999.

(b) The Registrant's  Quarterly Report on Form 10-Q for the fiscal quarter ended
March 31, 2000 filed pursuant to the Securities Exchange Act of 1934 as amended,
which contains unaudited financial statements for the fiscal quarter ended March
31, 2000.

(c)  The  section  entitled  "Description  of  Registrant's   Securities  to  be
Registered"  contained in the Registrant's  Registration  Statement on Form 8-A,
filed pursuant to Section 12(g) of the Securities Exchange Act.

(d) All documents subsequently filed with the Commission by the Company pursuant
to Sections 13(a),  13(c), 14 and 15(d) of the Exchange Act, prior to the filing
of a post-effective amendment which indicates that all securities offered herein
have been sold or which deregisters all securities then remaining unsold,  shall
be deemed to be incorporated by reference in this Registration  Statement and to
be a part hereof from the date of filing such documents.

                                       -6-

                                                                             -8-


<PAGE>



                    INDEMNIFICATION OF DIRECTORS AND OFFICERS

The Company is  permitted  by  Massachusetts  law and required by its By-laws to
indemnify  any  director or officer or former  director  or officer  against all
expenses and liabilities reasonably incurred by him in connection with any legal
action in which  such  person is  involved  by reason of his  position  with the
Company  unless he shall have been finally  adjudicated  in any action,  suit or
proceeding  not to have acted in good faith in the  reasonable  belief  that his
action was in the best  interests of the  Company.  Such  indemnification  shall
include  payment by the  Company of expenses  incurred  in  defending a civil or
criminal action or proceeding in advance of the final disposition of such action
or  proceeding,  upon the  Company's  receipt of the  undertaking  of the person
indemnified  to repay  such  payment if such  person  shall be  adjudicated  not
entitled to such indemnification.

Directors and officers are also insured up to an aggregate amount of $10 million
under a Directors' and Officers' Liability and Company Reimbursement Policy.

The Company's Restated Articles of Organization include a provision limiting the
personal  liability of directors of the Company to its stockholders for monetary
damages for  breaches of their  fiduciary  duty to the extent  permitted  by the
Massachusetts Business Corporation Law.

Insofar as indemnification  for liabilities  arising under the Securities Act of
1933 may be permitted to  directors,  officers  and  controlling  persons of the
Company pursuant to the foregoing provisions or otherwise,  the Company has been
advised  that in the opinion of the  Securities  and  Exchange  Commission  such
indemnification  is against  public policy as expressed in the Securities Act of
1933  and  is,  therefore,   unenforceable.  In  the  event  that  a  claim  for
indemnification  against such liabilities (other than the payment by the Company
of expenses incurred or paid by a director, officer or controlling person of the
Company 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 Company  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  Securities  Act of 1933, as amended,
and will be governed by the final adjudication of such issue.

                                       -7-

                                                                             -9-


<PAGE>






You should rely only on the information  contained in this  prospectus.  We have
not  authorized  anyone to  provide  you with  information  different  from that
contained in this prospectus. The selling stockholders are offering to sell, and
seeking offers to buy, shares of Common Stock only in jurisdictions where offers
and sales  are  permitted.  The  information  contained  in this  prospectus  is
accurate  only as of the  date of this  prospectus,  regardless  of the  time of
delivery  of  this  prospectus  or of any  sale  of the  Common  Stock.  In this
prospectus,  references  to  "Ionics,"  "we,"  "our" and "us"  refer to  Ionics,
Incorporated.

                                -----------------

                                TABLE OF CONTENTS

                                               Page

Available Information ......................     2
The Company ................................     3
Use of Proceeds ............................     3
Selling Stockholders........................     3
Plan of Distribution .......................     5
Legal Matters ..............................     6
Incorporation of Certain Information
  by Reference..............................     6
Indemnification of
  Directors and Officers... ................     7




                                  91,000 Shares

                              Ionics, Incorporated

                                  91,000 Shares

                                   Common Stock

                                  ---------------

                                     REOFFER
                                    PROSPECTUS

                                  ---------------



                                  June 20, 2000



                                                                            -10-


<PAGE>



                                     PART I

              INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS

Item 1.  Plan Information.
-------------------------

The documents  containing the information  specified in this Item 1 will be sent
or given  to  participants  in the  1986  Stock  Option  Plan  for  Non-Employee
Directors as  specified  by Rule  428(b)(1).  In  accordance  with the rules and
regulations of the Securities and Exchange Commission (the "Commission") and the
instructions to Form S-8, such documents are not being filed with the Commission
either as part of this  Registration  Statement or as prospectuses or prospectus
supplements pursuant to Rule 424.

Item 2.  Registrant Information and Employee Plan Annual Information.
--------------------------------------------------------------------

The documents  containing the information  specified in this Item 2 will be sent
or given to participants as specified by Rule 428(b)(1).  In accordance with the
rules and  regulations of the Commission and the  instructions to Form S-8, such
documents  are not  being  filed  with  the  Commission  either  as part of this
Registration  Statement or as prospectuses or prospectus supplements pursuant to
Rule 424.

                                     PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3.  Incorporation of Documents by Reference.
------------------------------------------------

The following  documents filed with the Commission are incorporated by reference
in this Prospectus:

(a) The Annual  Report of the  Registrant on Form 10-K for the fiscal year ended
December 31, 1999 filed  pursuant to the  Securities  Exchange  Act of 1934,  as
amended,  which contains audited financial  statements of the Registrant for the
fiscal year ended December 31, 1999.

(b) The Quarterly  Report of the  Registrant on Form 10-Q for the fiscal quarter
ended March 31, 2000 filed  pursuant to the  Securities  Exchange Act of 1934 as
amended, which contains unaudited financial statements of the Registrant for the
fiscal quarter ended March 31, 2000.

(c)  The  section  entitled  "Description  of  Registrant's   Securities  to  be
Registered"  contained in the Registrant's  Registration  Statement on Form 8-A,
filed pursuant to Section 12(g) of the Exchange Act.

                                                                            -11-


<PAGE>



(d) All documents subsequently filed with the Commission by the Company pursuant
to Sections 13(a),  13(c), 14 and 15(d) of the Exchange Act, prior to the filing
of a post-effective amendment which indicates that all securities offered herein
have been sold or which deregisters all securities then remaining unsold,  shall
be deemed to be incorporated by reference in this Registration  Statement and to
be a part hereof from the date of filing such documents.

Item 4.  Description of Securities.
----------------------------------

Not applicable.

Item 5.  Interest of Named Experts and Counsel.
----------------------------------------------

The  validity of the shares of Common Stock  offered  hereby will be passed upon
for the Registrant by Stephen Korn,  Esq., Vice President and General Counsel of
the Company.  Mr. Korn is the beneficial owner of 90,086 shares of Common Stock,
including  88,000  shares of Common Stock in the form of  presently  exercisable
stock  options and 863 shares held in the Ionics  Section  401(k) Stock  Savings
Plan (based on January 31, 2000 data).

Item 6.  Indemnification of Directors and Officers.
--------------------------------------------------

The Company is  permitted  by  Massachusetts  law and required by its By-laws to
indemnify  any  director or officer or former  director  or officer  against all
expenses and liabilities reasonably incurred by him in connection with any legal
action in which  such  person is  involved  by reason of his  position  with the
Company  unless he shall have been finally  adjudicated  in any action,  suit or
proceeding  not to have acted in good faith in the  reasonable  belief  that his
action was in the best  interests of the  Company.  Such  indemnification  shall
include  payment by the  Company of expenses  incurred  in  defending a civil or
criminal action or proceeding in advance of the final disposition of such action
or  proceeding,  upon the  Company's  receipt of the  undertaking  of the person
indemnified  to repay  such  payment if such  person  shall be  adjudicated  not
entitled to such indemnification.

Directors and officers are also insured up to an aggregate amount of $10 million
under a Directors' and Officers' Liability and Company Reimbursement Policy.

The Company's Restated Articles of Organization include a provision limiting the
personal  liability of directors of the Company to its stockholders for monetary
damages for  breaches of their  fiduciary  duty to the extent  permitted  by the
Massachusetts Business Corporation Law.

Item 7.  Exemption from Registration Claimed.
--------------------------------------------

Not applicable.



                                                                            -12-


<PAGE>


Item 8.  Exhibits.
-----------------

Exhibit No.              Description of Exhibit
-----------              ----------------------

*4.1                     Renewed Rights Agreement,  dated as of August 19, 1997,
                         between  the  Company  and  BankBoston  N.A.  (filed as
                         Exhibit 1 to the Company's  Current  Report on Form 8-K
                         dated August 27, 1997).

*4.2                     Form of Common Stock Certificate (filed as Exhibit 4.2
                         to the Company's Annual Report on Form 10-K for the
                         year ended December 31, 1995).

*4.3                     Ionics,   Incorporated   1986  Stock  Option  Plan  for
                         Non-Employee Directors, as amended through February 19,
                         1997(filed  as  Exhibit  10.2 to the  Company's  Annual
                         Report on Form  10-K for the year  ended  December  31,
                         1996).

*5.1                     Opinion of Stephen Korn, General Counsel (filed on
                         November 12,1992 as exhibit 5.1 to the Company's
                         registration statement on Form S-8, No. 33-54400).

 23.1                    Consent of PricewaterhouseCoopers LLP.

*23.2                    Consent of Stephen Korn, General Counsel (included in
                         Exhibit 5 as previously filed).

*24.0                    Power of Attorney (filed on November 12, 1992 as
                         Exhibit 25 to Company's registration statement on Form
                         S-8, No. 33-54400).

*Incorporated herein by reference.

Item 9.  Undertakings.
---------------------

(a) The undersigned registrant hereby undertakes:

      (1) To file,  during any period in which offers or sales are being made, a
post-effective amendment to this registration statement:

          (i) To include any prospectus required by Section 10(a)(3) of the
Securities Act of 1933;

          (ii) To reflect in the  prospectus  any facts or events  arising after
the effective  date  of  the   registration   statement  (or the most recent
post-effective amendment thereof) which, individually or in the aggregate,
represents a fundamental change in the information set forth in the registration
statement;

                                                                            -13-

          (iii) To include any material  information with respect to the plan of
distribution  not  previously  disclosed  in the  registration  statement or any
material change to such information in the registration statement;

          Provided,  however,  that  paragraphs  (a)(1)(i) and (a)(1)(ii) do not
apply  if the  registration  statement  is on  Form  S-3 or  Form  S-8  and  the
information  required  to be  included in a  post-effective  amendment  by those
paragraphs is contained in periodic reports filed by the registrant  pursuant to
section 13 or section  145(d) of the  Securities  Exchange  Act of 1934 that are
incorporated by reference in the registration statement.

       (2)  That,  for the  purpose  of  determining  any  liability  under  the
Securities Act of 1933, each such post-effective amendment shall be deemed to be
a new registration statement relating to the securities offered therein, and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof.

       (3) To remove from  registration by means of a  post-effective  amendment
any of the securities being registered which remain unsold at the termination of
the offering.

(b)  The  undersigned   registrant  hereby  undertakes  that,  for  purposes  of
determining  any liability  under the Securities Act of 1933, each filing of the
registrant's  annual report pursuant to Section 13(a) or 15(d) of the Securities
Exchange Act of 1934 (and, where applicable,  each filing of an employee benefit
plan's annual report pursuant to section 15(d) of the Securities Exchange Act of
1934) that is incorporated by reference in the  registration  statement shall be
deemed to be a new  registration  statement  relating to the securities  offered
therein,  and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.

(c) 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  connected 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.

                                                                            -14-


<PAGE>


                                   SIGNATURES

Pursuant to the  requirements  of the  Securities  Act of 1933,  the  Registrant
certifies  that it has  reasonable  grounds to believe  that it meets all of the
requirements  for  filing on Form S-8 and has duly  caused  this  Post-Effective
Amendment  No. 3 to  Registration  Statement  to be signed on its  behalf by the
undersigned,   thereunto  duly   authorized,   in  the  Town  of  Watertown  and
Commonwealth of Massachusetts on the 20th day of June, 2000.

                                      IONICS, INCORPORATED

                                      By:/s/ Arthur L. Goldstein
                                       -----------------------------
                                             Arthur L. Goldstein
                                             Chairman of the Board,
                                             President and
                                             Chief Executive Officer

Pursuant to the requirements of the Securities Act of 1933, this  Post-Effective
Amendment  No. 3 to  Registration  Statement  has been  signed by the  following
persons in the capacities and on the date indicated.

Signature                         Title                          Date
---------                         -----                          ----

/s/ Arthur L. Goldstein
-----------------------------     Chairman of the Board          June  20, 2000
    Arthur L. Goldstein           President and Chief
                                  Executive Officer
                                  (Principal Executive Officer)

/s/ Robert J. Halliday
------------------------------    Executive Vice President,      June  20, 2000
    Robert J. Halliday            Chief Operating Officer and
                                  Chief Financial Officer
                                  (Principal Financial Officer)



                                                                            -15-


<PAGE>


Pursuant to the requirements of the Securities Act of 1933, this  Post-Effective
Amendment  No. 3 to  Registration  Statement  has been  signed by the  following
persons in the capacities and on the date indicated.

Signature                         Title                             Date
---------                         -----                             ----

s/Douglas R. Brown              Director                        June  20, 2000
-------------------
Douglas R. Brown


Stephen L. Brown                Director

/s/William L. Brown             Director                        June  20, 2000
-------------------
William L. Brown

/s/Arnaud de Vitry d'Avaucourt  Director                        June  20, 2000
------------------------------
Arnaud de Vitry d'Avaucourt

/s/Arthur L. Goldstein          Chairman of the Board           June  20, 2000
----------------------          and Director
Arthur L. Goldstein

/s/William E. Katz              Director                        June  20, 2000
------------------
William E. Katz

/s/Kathleen F. Feldstein        Director                        June  20, 2000
------------------------
Kathleen F. Feldstein


William K. Reilly               Director

/s/John J. Shields              Director                        June  20, 2000
------------------
John J. Shields

/s/Carl S. Sloane               Director                        June  20, 2000
-----------------
Carl S. Sloane

/s/Daniel I. C. Wang            Director                        June  20, 2000
--------------------
Daniel I. C. Wang

/s/Mark S. Wrighton             Director                        June  20, 2000
-------------------
Mark S. Wrighton

/s/Allen S. Wyett               Director                        June  20, 2000
-----------------
Allen S. Wyett

                                                                            -16-


<PAGE>


EXHIBIT INDEX

                                                                  Sequentially
Exhibit No.       Description of Exhibits                         Numbered Page
-----------       -----------------------                         -------------

4.1               Renewed Rights Agreement, dated as of August          *
                  19, 1997, between the Company and
                  BankBoston N.A.  (filed as Exhibit 1 to the
                  Company's Current Report on Form 8-K dated
                  August 27, 1997).

4.2               Form of Common Stock Certificate (filed as            *
                  Exhibit 4.2 to the Company's Annual Report
                  on Form 10-K for the year ended December
                  31, 1995).

4.3               Ionics, Incorporated 1986 Stock Option Plan           *
                  for Non-Employee Directors, as amended through
                  February 19, 1997 (filed as Exhibit 10.2 to
                  the Company's Annual Report on Form 10-K for
                  the year ended December 31, 1996).

5.1               Opinion of Stephen Korn, General Counsel              *
                  (filed as Exhibit 5.1 to the Company's
                  Registration Statement on Form S-8, No.
                  33-54400).

23.1              Consent of PricewaterhouseCoopers LLP.               18

23.2              Consent of Stephen Korn, General Counsel              *
                  (included in Exhibit 5.1 as previously filed).

24.0              Power of Attorney (filed as Exhibit 25 to             *
                  Company's Registration Statement on Form S-8,
                  No. 33-5440).

*Incorporated herein by reference.


                                                                            -17-



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