OSMONICS INC
10-K, 1998-03-30
GENERAL INDUSTRIAL MACHINERY & EQUIPMENT, NEC
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                         SECURITIES AND EXCHANGE COMMISSION
                               Washington, D.C.  20549
                         __________________________________

                                      FORM 10-K

            (Mark One)
            [X]   ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                  SECURITIES EXCHANGE ACT OF 1934 
            For the Fiscal Year Ended December 31, 1997

                                         OR

            [  ]  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF 
                  THE SECURITIES EXCHANGE ACT OF 1934 
            For the transition period from _________ to ________

                               Commission File No. 1-12714

                                      OSMONICS, INC.

                  (Exact name of registrant as specified in its charter)

                      Minnesota                            41-0955959

             (State or other jurisdiction          (I.R.S. Employer
                 of incorporation or               Identification No.)
                    organization)

            5951 Clearwater Drive, Minnetonka, Minnesota         55343

            (Address of principal executive offices)             (Zip Code)

                                     (612) 933-2277

                                (Registrant's telephone
                                        number)

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

            Common Shares, par value
            $0.01 per share                       New York Stock Exchange

                (Title of each class)         (Name of each exchange on which
                                              registered)

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

                                          None.

                 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     <PAGE>


                 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.  [X].

                 As of March 4, 1998, 13,953,584 Common Shares were
            outstanding.  The aggregate market value of the Common
            Shares held by non-affiliates of the Registrant on such date
            (based upon the closing price of such shares on the New York
            Stock Exchange on March 4, 1998) was $228,489,938.


                      DOCUMENTS INCORPORATED BY REFERENCE

                 Portions of the Annual Report to Shareholders for the
            fiscal year ended December 31, 1997 (the "Annual Report to
            Shareholders"), are incorporated by reference into Parts II
            and IV.  Portions of the definitive Proxy Statement for the
            Annual Meeting of Shareholders to be held on May 13, 1998
            (the "Proxy Statement"), and to be filed within 120 days
            after the Registrant's fiscal year ended December 31, 1997,
            are incorporated by reference into Part III.

                                     PART I

            ITEM 1.  BUSINESS

                 The following discussion contains certain information
            and other forward-looking statements that involve a number
            of risks and uncertainties.  The actual results of Osmonics
            could differ materially from the Company's historical
            results of operations and those discussed in the forward-
            looking statements.

                 Osmonics, Inc. and its wholly-owned subsidiaries (the
            "Company") design, manufacture and market machines, systems
            and components used in the processing and handling of
            fluids.  The Company was founded in 1969 and manufactures
            replaceable, semi-permeable membranes and other filter media
            for use in fluid separation and filtration.  The Company's
            processing equipment employs crossflow filtration (including
            reverse osmosis, nanofiltration, ultrafiltration and
            microfiltration), normal filtration (including
            microfiltration and particle filtration), coalescing
            filtration, ion exchange, clarification, chromatography,
            ozonation and distillation.  The Company's fluid handling
            equipment includes centrifugal, diaphragm and bellows pumps;
            electronic controllers to operate precision valves for water
            conditioning; flow control and measuring devices and
            instrumentation; and specialty holders and devices for
            retaining its membranes and filter media.

                 Crossflow, normal and coalescing filtration are
            precision processes in which a semi-permeable membrane or
            other filter material separates a fluid's components. 
            Separation is accomplished by applying pressure to a fluid
            in order to cause selective passage of some components of
            the fluid through the membrane or filter media.  Ion
            exchange and chromatography are quasi-filtration processes
            in which specialized plastic beads are used to selectively
            remove ionized or charged particles from a fluid.  The fluid
            is pressurized and passes through a bed of the plastic beads
            in a normal filtration mode.  Distillation is the
            condensation of steam from boiling water to produce
            ultrapure water.  Ozone generation equipment uses
            electricity to develop a corona discharge which produces
            ozone, a strong oxidant used in the purification of water
            and other fluids.

                 The Company's processing products are used in
            fractionation, preferential separation, conditioning and
            purification in connection with such processes as
            purification of water and industrial solutions, dewatering
            and recycling of commercial and industrial fluids, pollution
            control and seawater desalting.  The Company's principal
            domestic and international markets, from which it derives
            more than 50% of its sales, include the electronics, potable
            water, health care, biotechnology, food and beverage,
            chemical processing and power generation industries.   

                 Filtration processes cover a broad spectrum ranging
            from those which separate discrete molecules and ions to
            those which separate particles visible to the naked eye. 
            Historically, the Company specialized in products utilizing
            crossflow filtration processes designed to separate
            particles in the molecular range.  Through acquisitions and
            internal product developments, the Company now has a full
            line of filtration products including depth cartridge
            filters for particle filtration and pleated membrane
            cartridge filters for microfiltration.  The filtration media
            and membrane is produced primarily from polymers; however,
            inorganic membranes and filters of metal and ceramic are
            also manufactured.  In addition, the Company manufactures
            housings to contain the filters.  The crossflow filter
            membrane elements, and the microfilter and depth filter
            cartridges are replaceable while the housings are a
            permanent fixture in the fluid processing system.

                 To provide a complete line of products for the
            production of pure water, the Company manufactures
            distillation equipment, both single-effect and more energy
            efficient multi-effect.  In addition, deionization and
            softening equipment in both laboratory size and large scale
            is manufactured in multiple locations. 

                 In June 1989, the Company acquired Ozone Research &
            Equipment Corporation of Phoenix, Arizona.  Ozone Research
            was founded in 1957 and is a pioneer in the manufacture of
            ozone generation equipment for the purification of water and
            the testing of elastomeric materials.

                 In November 1989, the Company acquired certain assets
            for the manufacture and sale of MACE flow control and
            pumping products to increase its fluid handling offerings. 
            MACE products are made from Teflon PTFE, the most chemically
            stable polymer available, and are used to handle ultrapure
            and aggressive chemicals. 

                 In December 1990, the Company acquired certain assets
            of the FASTEK Division of Eastman Kodak for the production
            of reverse osmosis membrane, home reverse osmosis membrane
            elements, a rolled filter product, and a blown microfiber
            filter cartridge product.  This Syracuse, New York facility
            and manufacturing equipment provides the Company with added
            capacity and capability and gives the Company three sites
            for manufacturing membrane and membrane elements.

                 In October 1993, the Company acquired Autotrol
            Corporation through a pooling-of-interests, stock-for-stock
            transaction.  Autotrol was founded in 1962 and is a leader
            in the manufacture of controllers for water softening and
            filtration equipment.  In addition, Autotrol manufactures
            other fluid control and measuring devices such as a
            totalizing flow meter and dosing system to assure proper
            treatment of cooling tower water.  Most of Autotrol's
            products are sold to OEM's who then use them as a component
            in a water conditioning device which is then sold to
            consumers. 

                 In November 1994, the Company acquired substantially
            all of the assets of Lakewood Instruments of Phoenix,
            Arizona.  This acquisition adds a line of instruments,
            sensors and analyzers used in the measurement of fluid
            characteristics in the chemical water treatment and pure
            water industries.

                 In October 1995, the Company acquired the assets and
            operations of Western Filter Company, Denver, Colorado, an
            important supplier to the beverage and bottled water
            industry for over 50 years.  Western Filter has extensive
            experience in providing the beverage market with
            conventional water treatment technologies and membrane water
            treatment.  Western Filter also has experience in
            coagulation clarification pretreatment technologies.  These
            technologies will be utilized with Osmonics' existing
            distribution channels, allowing the Company to expand
            capability in the international markets where conventional
            water treatment is required, as well as complement municipal
            sales in the United States where ozone disinfection is
            becoming accepted.

                 In July 1996, the Company acquired Desalination
            Systems, Inc. ("Desal") through a pooling-of-interests,
            stock-for-stock transaction.  Desal manufactures crossflow
            filtration membrane and membrane elements.  Desal has
            manufacturing facilities in Vista, California, and markets
            its products world-wide.  Desal's products extend the range
            of membranes and membrane elements previously offered by the
            Company.  The acquisition also extends the Company's
            distribution network for such products. 

                 In February 1997, the Company acquired AquaMatic, Inc.
            of Rockford, Illinois.  AquaMatic, started in 1930, offers a
            line of specialty valves and controllers for the water
            conditioning market, which will be sold through existing
            Osmonics distribution channels.

                 In December 1997, the Company acquired Purifications
            Products Company ("PPC") of San Marcos, California.  PPC
            manufactures a line of reverse osmosis membrane elements and
            related products for purifying home drinking water and
            producing high-quality water for other applications.  In
            addition, PPC has a line of Silt Density Index instruments
            and a line of UV sterilization products.  These products
            will be sold through existing Osmonics distribution
            channels.

                 In February 1998, the Company acquired Micron
            Separations, Inc. ("MSI") of Westborough, Massachusetts. 
            MSI, in business for 16 years, develops, manufactures and
            markets microfilter membrane and membrane products for
            diagnostic, laboratory and industrial use.  These products
            will expand the Company's range of nylon and cellulosic
            membrane applications.  The products will be sold through
            existing Osmonics distribution channels.

                 In March 1998, the Company signed a definitive
            agreement, to acquire Membrex Corp. of Fairfield, New
            Jersey.  The acquisition is subject to Membrex shareholder
            approval.  The acquisition of Membrex would give the Company
            the most hydrophilic UF membrane in the market, which is
            used to separate oil from water in a variety of
            applications, including biotechnology, laboratory and
            chemical processes.  Membrex also has a patented machine
            using its UF membrane which will separate oil from water for
            use in parts cleaning and other industrial and commercial
            applications.  Some products will be sold through our
            exclusive agreement with Safety-Kleen Corp. and the
            remainder through existing Osmonics distribution channels. 

                 The Company focuses the marketing of its products
            through three domestic and international sales groups:

               1.  Large equipment and systems.

               2.  Components and product sales.

               3.  Catalog and telephone sales.

            These sales groups are supported by application engineers
            and market support personnel. 

            Products

                 Membranes:  The Company markets polymer membranes for
            crossflow applications sold in replaceable elements.  Most
            membranes are produced in a spiral-wound configuration
            ranging in diameter from two to twelve inches and in length
            from twelve to sixty inches. 

                 Membrane elements are typically replaced every 6 to 60
            months, depending upon the severity of the application.  The
            Company manufactures the membrane material and membrane
            elements used in its own systems, and also manufactures
            membrane elements for other original equipment manufacturers
            (OEM's) who include them as component parts in their
            products. 

                 The Company's membranes are used in many bioengineering
            processes such as the production of high fructose corn
            sugar, enzyme purification, and purification of
            pharmaceuticals produced by biological processes.  Other
            uses include water purification applications in
            hemodialysis, semiconductor manufacturing, production of
            pure water for beverages, production of ultrapure
            pharmaceutical and boiler feed water, industrial water
            purification and waste removal for pollution control
            compliance.  In addition, the Company sells its home reverse
            osmosis (HRO) membrane elements to OEM's who package them
            into systems for use in homes, offices and retail vending
            establishments to produce purified drinking water.  The
            Company is registered with the United States Food and Drug
            Administration for the manufacture and sale of certain
            membrane elements used in biological preparations.  The
            Company is registered with the U.S. FDA for the manufacture
            of Class II medical devices used to purify water for
            hemodialysis. 

            The Company markets microfiltration normal flow membrane and
            the hardware for use in a variety of laboratory and medical
            diagnostic applications.  The Company manufactures nylon,
            cellulosic polysulfone, polycarbonate, and numerous other
            polymer-based microfiltration membrane as well as silver
            microfiltration membranes and ceramic microfilters. 
            Numerous applications exist for the Company's microfilters
            because of unique features, including use in air monitoring
            and in laboratory procedures for cancer and other research.

                 Filters:  The Company markets replaceable depth
            cartridge filters, pleated cartridge filters, and rolled
            cartridge filters.  The depth cartridge filters consist of a
            matrix of thermally-bonded polypropylene blown microfibers.
             The structure of these fibers allows particles to be
            trapped throughout the depth of the cartridge filter rather
            than simply on its surface, enhancing the efficiency of the
            filtration process.  The pleated cartridge filters use
            either a specially processed sheet of blown polypropylene
            microfibers or microporous membranes and use surface
            filtration to act as a very selective filter.  Rolled
            cartridge filters use media similar to pleated filters in a
            semicrossflow configuration, for enhanced filtration in
            specialized applications.  Cartridge filters are
            manufactured in a range of pore sizes and particulate
            retention ratings.  As a result of retention of particles in
            the filters, cartridge filters are typically replaced at
            intervals of eight hours to four weeks.

                 The Company markets ceramic cartridge filters for
            microfiltration and particulate filtration.  The ceramic
            cartridge filters operate similar to the pleated cartridge
            filters in that particles are trapped on the surface. 
            Ceramic cartridge filters are used to sterilize
            pharmaceutical solutions and are used in laboratory
            applications, where many analytic and diagnostic procedures
            require purification or sterilization.

                 The Company also markets separation elements and
            equipment used in coalescing filtration, a process distinct
            from crossflow and normal filtration, which separates
            different liquids based on their density and adsorption
            differences.  This process can reduce concentrations of
            contaminants of several percent to only a few parts per
            million.  Applications of coalescing filtration include
            removal of contaminants from compressed air and gas lines,
            dewatering of solvents and jet fuel, and removal of trace
            oil from waste water prior to disposal.

                 Ion Exchange and Chromatography Equipment:  The Company
            markets equipment using ion exchange technology.  Ion
            exchange plastic beads and selected polymer gels are
            utilized to preferentially adsorb ionized and charged
            material from a fluid stream.  After the ion exchange beads
            have adsorbed a certain amount of material, they must be
            regenerated, typically with acid or caustic, or in the case
            of chromatography with a selected fluid to strip off the
            adsorbed material.  The most used ion exchange process is
            for water softening where the ions of calcium and magnesium
            are replaced with sodium to reduce soap usage, improve
            boiler operation and improve cleaning.  The Company is a
            leader in the manufacture of the controllers and valves used
            to effect ion exchange.  Another ion exchange application is
            to polish ultrapure water for electronics manufacture and
            high pressure boiler feed.  Chromatography is primarily used
            to purify biotech fluids and food proteins.

                 Distillation Equipment:  The Company markets
            distillation and related water purification equipment used
            primarily in the laboratory and pharmaceutical industries. 
            Distillation, which involves the condensation of steam from
            boiling water, was one of the first technologies used to
            purify water.  The Company's distillation product lines
            range from laboratory stills to elaborate 5000-gallon-per-
            hour multi-stage purifiers. 

                 Ozonation Equipment:  The Company markets equipment to
            generate ozone from electricity using corona discharge. 
            Ozone is becoming increasingly important as a bactericide
            and water purifier because it kills bacteria, virus and
            giardia cysts 10 to 300 times faster than chlorine.

                 Ozone is also effective in oxidizing trace organic
            materials in water which are precursors of the carcinogenic
            trihalomethanes.  Ozone can also be used to purify solvent-
            contaminated groundwater and is often used to de-color water
            and waste water.

                 In 1997, the Company announced a partnership with Fuji
            Electric Co., Ltd., Japan and Fuji Electric Corp. of America
            (Fuji) to manufacture high concentration ozone generators
            using proprietary Fuji technology and components.  This
            partnership will provide the Company a strong entry into the
            municipal water treatment market, as well as pulp and paper
            and other large-scale oxidation applications.  As part of
            the agreement, the Company has the rights to manufacture and
            sell such equipment world-wide except for Japan and Korea.

                 Pumps, Valves and Flow Control Devices:  The Company
            markets a line of multi-stage centrifugal pumps.  These
            pumps were developed by the Company to meet the need for
            dependable high pressure pumps and are available in 60
            standard sizes with flows ranging from 3 gallons per minute
            to 500 gallons per minute and pressure capabilities from 25
            pounds per square inch (psi) to 500 psi.  The pumps are
            capable of operating in series to obtain 1000 psi for
            seawater desalting and other high pressure applications.

                 The Company markets two types of chemical-resistant,
            air-operated pumps used in both the chemical and electronics
            industries.  These unique pumps are constructed of Teflon
            PTFE or polypropylene materials making them resistant to
            acids, caustics, solvents and numerous other aggressive
            chemicals.

                 The Company markets a dry chemical feeder system to
            sanitize well water and reduce iron and sulfur odors, and
            also markets the pellets used in the feeder. 

                 The Company markets totalizing flow meters and
            electronic controllers made of corrosion resistant Noryl
            plastic, as well as a line of Teflon PTFE fluid control
            products including valves, fittings and flow meters used in
            the electronics, pharmaceutical and chemical industries. 
            The PTFE is molded and machined into unique shapes to
            provide extremely chemical resistant high temperature parts.

                 The Company markets both analog and digital instruments
            for chemical water treatment and monitoring.The instruments
            are used to measure and control conductivity, pH, ORP,
            chlorine, specific ions, trihalomethanes (THM's) and
            solvents in water, such as trichloroethyleneThe instruments
            are capable of being used in local operating network (LON)
            communications and data acquisition.

                 Machines and Systems:  The crossflow and normal
            filtration machines manufactured by the Company are
            comprised of one or more membrane elements, cartridge
            filters, pumps, valves, controls, transformers, heat
            exchangers, pipes and a steel frame on which the components
            are mounted.  The size and number of membrane elements and
            filters can vary greatly.  Pumps, pipes and frames of
            various sizes can be combined and configured to accommodate
            the membrane elements or filters required for various fluid
            handling or separation tasks.

                 The systems sold by the Company are comprised of one or
            more machines or pieces of equipment designed and
            manufactured by the Company as well as ancillary equipment,
            such as additional pumps, heat exchangers and holding tanks.
            The type, size and number of machines and the ancillary
            equipment included in a system will vary with the nature and
            size of the fluid separation task. 

                 The following table shows the percentage of net sales
            during the past five years attributable to the Company's
            fluid processing and handling equipment compared to its
            replaceable components:

                   Year Ended                  Replaceable           
                   December 31   Equipment(1)  Components(2)
                      1997           46%            54%
                      1996           49%            51%
                      1995           48%            52%
                      1994           51%            49%
                      1993           49%            51%

                (1) Equipment includes: (i) pumps, control valves,
                instruments and machines sold separately, (ii) pumps,
                controls, instruments, valves, fittings, chemicals, and
                other ancillary equipment sold with systems and (iii)
                membrane elements, filter elements, ion exchange resin
                and filter cartridges sold with machines.

                (2) Replaceable components include only those membrane,
                coalescer and dielectric elements, cartridges,
                membranes, filters and other components sold by the
                Company as replacements for its machines, systems and
                products, or as replaceable components for products
                manufactured by others.  They do not include those
                components originally sold as parts of new machines or
                systems manufactured by the Company.  Sales of
                components and replacement parts provide the Company
                with a relatively stable and continuing source of
                revenue.

            Sales and Marketing

                 The Company markets its custom machines and systems
            through its direct sales force.  The Company's standard
            products are marketed to a network of independent
            distributors with the help of Company district managers. 
            These distributors provide world-wide installation service
            and stocking of a wide range of the Company's standard
            products.  Some sales are made directly to certain of the
            Company's largest customers and to other manufacturers of
            filtration equipment and systems.

                 The Company's marketing activities include appearances
            at trade shows, direct mail campaigns, advertisements in
            professional and trade journals and appearances before
            professional organizations.  The Company participates with
            its customers in planning the systems in which its products
            are to be used, particularly if new applications are
            involved.  In some cases, the sale of a system designed for
            a particular customer may result from an engineering and
            service relationship which has extended over several years.

            Research and Development

                 Research and development activities emphasize product
            development and applied research, with the goal of
            developing proprietary products.  Such expenditures totaled
            $10,635,000 in 1997, $10,937,000 in 1996 and $9,399,000 in
            1995.  The Company anticipates that research and development
            expenditures in 1998 will be reduced fromthe 1997 level as a
            percent of sales.

            Patents and Trademarks

                 The Company has been granted domestic and certain
            foreign trademarks on numerous product names, and on its
            logo-types.  The Company holds domestic and foreign patents
            on certain of its filter media, filters, controlling valves,
            machine designs and other products.  Although the Company
            believes that its patents have value, the Company's business
            is not dependent on any patent or group of related patents.
             The Company considers its technological position to be
            based primarily on its proprietary manufacturing methods,
            innovative engineering and marketing expertise.

            Employees

                 As of December 31, 1997, the Company employed 1,433
            persons, including 257 holding engineering or technical
            degrees.

            Competition

                 The Company experiences competition from a variety of
            sources with respect to virtually all of its products,
            although the Company knows of no single entity that competes
            with it across the full range of its products and systems. 
            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
            water treatment equipment business activity, 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.  In ozone and distillation
            equipment, there are both large and small competitors with
            no single dominant competitor.  In water softener controls
            and valves, the Company has three primary and numerous
            secondary competitors.  Some competitors sell only
            controller valves and some sell complete softeners.  The
            Company has numerous competitors in its conventional water
            treatment and filtration products business activities. 

                 With respect to the Company's disposable filter and lab
            products, two companies, Pall and Millipore, dominate the
            industry with several smaller companies competing in
            selected product lines. 

                 With respect to the Company's pump and fluid handling
            products, there are numerous competitors of larger size and
            with greater resources than the Company.  Some competitors
            have significantly broader product lines than the Company. 

                 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.

            Raw Materials

                 The principal raw materials used by the Company are
            various plastic materials including polyvinyl chloride,
            polypropylene, Noryl PPO, Nylon cellulose acetate,
            polycarbonate, polyester, polysulfone, and PTFE; ceramic and
            glass materials, stainless steel, steel, brass, copper,
            titanium, silver and various other synthetic materials, all
            of which are normally available from sources within the
            continental United States.  Most raw materials used by the
            Company are available from multiple sources of supply.  A
            limited number of materials are proprietary products of
            major chemical companies which, if not available, would have
            a material effect on the Company's sales and profits.  The
            Company believes it could find substitutes for these
            materials if they should become unavailable, but has no
            assurance that the substitute would perform as well or be
            priced as favorably.

                 To date, the Company has experienced no difficulty in
            securing any of its needed raw materials and components.

            Customers

                 No one customer accounted for 10 percent or more of the
            Company's consolidated revenue in 1997, 1996 or 1995.

            Backlog

                 The dollar amount of the Company's backlog of orders
            considered to be firm at December 31, 1997, was $28.2
            million.  The comparable backlog at December 31, 1996, was
            $27.9 million.  The Company expects that nearly all orders
            included in the backlog at December 31, 1997, will be filled
            during the 1998 fiscal year.  The Company does not believe
            that its backlog at any time is necessarily indicative of
            annual sales.  The business of the Company is not subject to
            significant seasonal variations. 

            Governmental Regulation

                 Certain applications of the Company's reverse osmosis
            and ultrafiltration products and distillation equipment are
            subject to governmental regulation.  Products used for
            fractionation of cheese whey for human consumption are
            subject to regulation by the United States Department of
            Agriculture.  Reverse osmosis, ultrafiltration and
            distillation systems used in medical applications,
            particularly the systems used in artificial kidney dialysis
            equipment and pharmaceutical water for injection, are
            subject to regulation by the United States Food and Drug
            Administration.  Ultrafiltration and microfiltration
            products used for biological separations are subject to
            regulation by the United States Food and Drug
            Administration.

                 To date, compliance with federal, state and local
            provisions relating to the protection of the environment has
            had no material effect upon the capital expenditures,
            earnings or competitive position of the Company.

            Foreign Operations

                 Substantially all of the Company's operations and
            assets are located in the United States.  The Company has
            sales offices and distribution facilities in France,
            Thailand, Switzerland, Hong Kong, Japan, Singapore and
            China.  Limited assembly is conducted in Europe and Asia. 
            The profitability of domestic and foreign sales is
            substantially equal.  Sales to Canada are made on the same
            trade terms as are available to U.S. customers.

                 Large export sales are primarily made on the basis of
            confirmed irrevocable letters of credit or time drafts to
            selected customers in U.S. dollars.  Therefore, the Company
            believes that problems of currency fluctuation or political
            and economic stability do not constitute substantial risks.
             See Note 13 of Notes to Consolidated Financial Statements
            for a breakdown of the Company's foreign operations and
            export sales by geographic area.


            ITEM 2.  PROPERTIES

                 The executive offices and principal manufacturing
            facilities of the Company are located in Minnetonka,
            Minnesota, a suburb of Minneapolis.

                 A summary of the Company's main operating facilities is
            as follows:

                Location    Status     Size            Function

            Minnetonka, MN  Owned 309,600 sq  Sales, Manufacturing,
                                       ft     Warehouse

            Vista, CA       Owned 108,000 sq  Sales, Manufacturing,
                                       ft     Warehouse

            Milwaukee, WI   Owned 103,700 sq  Sales, Manufacturing,
                                       ft     Warehouse

            Rockford, IL    Owned  58,400 sq  Sales, Manufacturing,
                                       ft     Warehouse

            Phoenix, AZ     Owned  57,600 sq  Sales, Manufacturing,
                                       ft     Warehouse

            Syracuse, NY    Owned  48,500 sq  Sales, Manufacturing,
                                      ft      Warehouse

            Westborough, M  Leased 47,500 sq  Sales, Manufacturing,
                                       ft     Warehouse

            Rockland, MA    Leased 38,200 sq  Sales, Manufacturing,
                                       ft     Warehouse

            Escondido, CA   Leased 30,000 sq  Manufacturing
                                       ft

            Upland, CA      Leased 22,000 sq  Sales, Manufacturing,
                                       ft     Warehouse

            Denver, CO      Owned  20,700 sq  Sales, Manufacturing,
                                       ft     Warehouse

            Ft. Lauderdale  Leased 20,000 sq  Sales, Warehouse
            FL                         ft

            Le Mee, France  Owned  18,300 sq  Sales, Manufacturing,
                                       ft     Warehouse

            Emmetsburg, IA  Leased 8,800 sq   Manufacturing,
                                       ft     Warehouse

            Livermore, CA   Leased 6,000 sq   Sales, Manufacturing,
                                       ft     Warehouse

            Bryan, TX       Owned   2,500 sq  Manufacturing,
                                       ft     Warehouse

            Total Owned           727,300 sq
                                       ft

            Total Leased          172,500 sq
                                       ft

            Total Owned
              and Leased          899,800 sq
                                       ft

                 Certain industrial revenue bonds of the Company are
            collateralized by real property of the Company. 

                 The current manufacturing facilities are adequate for
            intermediate-term operations.  In addition, the Company
            leases space in Thailand, China, Japan, Hong Kong,
            Switzerland and Singapore that is used primarily for sales
            activities. 

            ITEM 3.  LEGAL PROCEEDINGS

                 The Company is currently involved in several lawsuits
            incidental to its business.  Management does not believe
            that any of the lawsuits will have a material adverse effect
            on the Company's financial position or results of
            operations.

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

                 No matter was submitted to a vote of the Company's
            security holders during the fourth quarter of the fiscal
            year that ended December 31, 1997.


                      Executive Officers of the Registrant

                                                              Officer
            Name and Age           Position with Company       Since

          D. Dean Spatz (53)       Chief Executive Officer     1969
                                   and Chairman of the Board

          Ruth Carol Spatz (53)    Secretary                   1969

          Howard W. Dicke (60)     Vice President Human        1978
                                   Resources and Corporate
                                   Development, and Treasurer

          L. Lee Runzheimer (55)   Chief Financial Officer     1988

          James J. Carbonari (56)  Vice President Sales &
                                   Marketing                   1989

          Kenneth E. Jondahl (41)  Vice President
                                   International               1991

          Andrew T. Rensink (41)   Vice President Technology   1991

          Kenton C. Toomey (50)    Vice President Operations   1997

                 All of the executive officers except Mr. Toomey have
            been officers of the Company for more than five years. Mr.
            Toomey joined Osmonics in April of 1997 as Vice President
            Operations.  Prior to that he had been the Vice President of
            Operations for DeZurik, a unit of General Signal. 
            Previously, throughout his 26 years with 3M Company, Mr.
            Toomey held numerous director and management positions in
            several 3M business units including plant manager of the
            Dental Products Division.  All executive officers are
            elected annually by, and serve at the direction of, the
            Board of Directors.  D. Dean Spatz and Ruth Carol Spatz are
            husband and wife.

                                    PART II

            ITEM 5.  MARKET FOR THE REGISTRANT'S COMMON EQUITY AND
                          RELATED SHAREHOLDER MATTERS

                 "Common Stock Data," and "Notes to Consolidated
            Financial Statements," pages 19-23 of the Annual Report to
            Shareholders, are incorporated herein by reference.  As of
            March 4, 1998 there were 2,499 shareholders of record.

                 The Company has not paid cash dividends on its common
            shares.  The Board of Directors currently intends to retain
            its earnings for the expansion of the Company's business. 
            The Company has issued promissory notes which contain a
            covenant limiting the payment of dividends to shareholders.
            At December 31, 1997, approximately $38,901,000 of retained
            earnings was restricted under this covenant. 

            ITEM 6.  SELECTED FINANCIAL DATA

                 "Selected Financial Data," page 29 of the Annual Report
            to Shareholders, is incorporated herein by reference.

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

                 "Management's Discussion and Analysis of Financial
            Condition and Results of Operations," pages 24 and 25 of the
            Annual Report to Shareholders, is incorporated herein by
            reference. 

            ITEM 8.  FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

                 The following consolidated financial information of the
            Registrant and its subsidiaries, included in the Annual
            Report to Shareholders, is incorporated herein by reference:

                                                              Page(s)

                 Consolidated Statements of Income  . . . . .    16

                 Consolidated Balance Sheets  . . . . . . . .    17

                 Consolidated Statements of Cash Flows  . . .    18

                 Consolidated Statements of Changes in

                 Shareholders' Equity   . . . . . . . . . . .    19

                 Notes to Consolidated Financial Statements .   19-23

                 Independent Auditors' Report   . . . . . . .    24

                 Quarterly Income Data  . . . . . . . . . . .    26


                                    PART III

          ITEM 10.  DIRECTORS

                 The information required by this Item is incorporated
          herein by reference to the definitive Proxy Statement, to be
          filed with the Securities and Exchange Commission within 120 days
          after the close of the Company's fiscal year ended December 31,
          1997 and forwarded to stockholders prior to the Company's 1998
          Annual Meeting of Stockholders (the 1998 Proxy Statement).


            ITEM 11.  EXECUTIVE COMPENSATION

                 The information required by this Item is incorporated
            herein by reference to the 1998 Proxy Statement.


            ITEM 12.  SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS
                      AND MANAGEMENT

                 The information required by this Item is incorporated
            herein by reference to the 1998 Proxy Statement.

            ITEM 13.  CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

                 The information required by this Item is incorporated
            herein by reference to the 1998 Proxy Statement. 


                                    PART IV

            ITEM 14.  EXHIBITS, FINANCIAL STATEMENT SCHEDULE, AND
                      REPORTS ON FORM 8-K

                    (a) (1) Financial Statement

                            The consolidated financial statements of the
                            Registrant and its subsidiaries, included in
                            the Annual Report to Shareholders, are
                            incorporated by reference in Item 8, and are
                            also incorporated herein by reference.

                    (a) (2) Financial Statement Schedules

                            Reports of Independent Public Accountants on
                            Supplemental Schedules to the Consolidated
                            Financial Statements.

                            Valuation and qualifying accounts.

                            Schedules not listed above have been omitted
                            because they are either not applicable, not
                            material or the required information has
                            been given in the financial statements or in
                            the notes to the financial statements.

                        (2) Agreement and Plan of Merger among
                            Desalination Systems, Inc., Osmonics, Inc.
                            and DSI Acquisition Corp. dated
                            May 17, 1996.  (Incorporated herein by
                            reference to Exhibit 2 to Registration
                            Statement on Form S-3, File No. 33-05029.)

                            (3)A. Certificate of Incorporation of the
                                  Registrant, as amended.  (Incorporated
                                  herein by reference to Exhibit 3.1 to
                                  Registration Statement on Form S-2,
                                  File No. 33-336.)  Certificate of
                                  Amendment.  (Incorporated herein by
                                  reference to Exhibit (3)A on Form 10-K
                                  for fiscal year ended December 31,
                                  1987, File No. 0-8282.)

                               B. By-Laws of the Registrant. 
                                  (Incorporated herein by reference to
                                  Exhibit 3.2 to Registration Statement
                                  on Form S-2, File No. 33-336.)

                            (4)A. Note Purchase Agreement dated July 12,
                                  1991.  (Incorporated herein by
                                  reference to Annual Report on Form 10-
                                  K for fiscal year ended December 31,
                                  1991.)

                          (10)A.* 1993 Stock Option Plan and related
                                  form of stock option agreement. 
                                  (Incorporated herein by reference to
                                  Annex C of the Registrant's Joint
                                  Proxy Statement/Prospectus dated
                                  September 10, 1993.)

                            B.    Stock Option Agreement with Michael L.
                                  Snow, Director.  (Incorporated herein
                                  by reference to Annual Report on Form
                                  10-K for fiscal year ended December
                                  31, 1993.)

                            C.*   1983 Stock Option Plan and related
                                  form of stock option agreement. 
                                  (Incorporated herein by reference to
                                  Exhibit 10.2 to Registration Statement
                                  on Form S-2, File No. 33-336.)

                            D.    1995 Employee Stock Purchase Plan. 
                                  (Incorporated herein by reference to
                                  the Registrant's Proxy Statement dated
                                  March 27, 1995.)

                            E.*   1995 Director Stock Option Plan. 
                                  (Incorporated herein by reference to
                                  the Registrant's Proxy Statement dated
                                  March 27, 1995.)

                                  * Denotes Executive Compensation Plan.

                           (13)   1997 Annual Report to Shareholders. 
                                  (Only those portions incorporated
                                  herein by reference shall be deemed
                                  filed with the Commission.)

                           (21)   Subsidiaries of the Registrant.

                           (23)   Consent of Deloitte & Touche LLP.

                    (b)     Reports on Form 8-K

                            No reports on Form 8-K were filed during the
                            quarter ended December 31, 1997.


                                     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.

                                     OSMONICS, INC.

                                     By  /s/ D. Dean Spatz             
                                             D. Dean Spatz, President

            Dated:  March 30, 1998


                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:

                 Signatures                  Title                Date


            /s/ L.Lee Runzheimer      Chief Financial          March 30,
                L.Lee Runzheimer      Officer                  1998
                                      (Principal Finance
                                      and Accounting
                                      Officer)

            /s/ Howard W. Dicke       Vice President           March 30,
                Howard W. Dicke       Human Resources          1998
                                      and Corporate
                                      Development, and
                                      Treasurer

            /s/ Ruth Carol Spatz      Director                 March 30,
                Ruth Carol Spatz                               1998

            /s/ Michael L. Snow       Director                 March 30,
                Michael L. Snow                                1998

            /s/ Ralph E. Crump        Director                 March 30,
                Ralph E. Crump                                 1998

            /s/ Verity C. Smith       Director                 March 30,
                Verity C. Smith                                1998

            /s/ Charles W. Palmer     Director                 March 30,
                Charles W. Palmer                              1998

            /s/ William Eykamp        Director                 March 30,
                William Eykamp                                 1998

            /s/ D. Dean Spatz         President,               March 30,
                D. Dean Spatz         Chairman of the          1998
                                      Board and Director
                                      (Principal
                                      Executive Officer)<PAGE>




                                   OSMONICS, INC.
                          CONSOLIDATED STATEMENTS OF INCOME

                          (In thousands, except share data)


                                             Year ended December 31,

                                            1997      1996      1995

            Sales                         $164,905  155,946   $130,783

            Cost of sales                   99,860   92,523     74,670

            Gross profit                    65,045   63,423     56,113

            Operating expenses:

             Selling, general and
             administrative                 39,603   35,079     31,377
             Research, development and
             engineering                    10,635   10,937      9,399
             Special charges                 1,448        -         -
                                            51,686   46,016     40,776

            Income from operations          13,359   17,407     15,337

            Other income (expense), net:

             Interest income                  913     1,023      1,649
             Interest expense              (2,226)   (1,594)    (1,565)
             Other                            344     3,072      1,412
                                             (969)    2,501      1,496
            Income from continuing
             operations before income      12,390    19,908     16,833
             taxes

            Income taxes (Note 11)          3,927     6,441      4,954

            Income from continuing
            operations                      8,463    13,467     11,879

            Recovery on discontinued
             operations
             (less income taxes of $617)    1,330         -          -
                                                             
            Net income                    $ 9,793   $13,467   $ 11,879

            Earnings per share _ basic
             (Note 16)
             Income from continuing
             operations                     $0.60     $0.95      $0.84
             Net income                     $0.70     $0.95      $0.84

            Earnings per share _
             assuming dilution
             (Note 16)
             Income from continuing
             operations                     $0.59     $0.93      $0.83
             Net income                     $0.68     $0.93      $0.83


                                   OSMONICS, INC.
                             CONSOLIDATED BALANCE SHEETS

                          (In thousands, except share data)

                                                        December 31,

                                                        1997      1996
                                                                 

            ASSETS
            Current assets:
             Cash and cash equivalents                $4,872     $5,392
             Marketable securities (Note 3)           17,004     19,028
             Trade accounts receivable, net of
             allowance for doubtful                   28,969     28,200
               accounts of $888 in 1997 and
               $907 in 1996
             Inventories (Note 4)                     35,228     32,322
             Deferred tax assets (Note 12)             1,413      1,559
             Other current assets                      1,639      2,026
               Total current assets                   89,125     88,527
            Property and equipment, at cost:
             Land and land improvements                5,535      5,485
             Buildings                                29,278     27,158
             Machinery and equipment                  62,555     50,045
             Construction in progress                    215      3,438
                                                      97,583     86,126
             Accumulated depreciation                (42,550)   (34,332)
                                                      55,033     51,794
            Cash restricted for purchase and
             construction of equipment (Note 5)        1,130      1,960
            Goodwill, net of accumulated
             amortization of $960 in 1997 and         15,257      7,395
             $553 in 1996
            Long-term investments                      1,016        726
            Other assets, net of accumulated
             amortization of tangible assets of        2,922      1,774
             $412 in 1997 and $342 in 1996                                
               Total assets                          $164,483    152,176

            LIABILITIES AND SHAREHOLDERS' EQUITY
                                 
            Current liabilities:
             Accounts payable                         $9,728     $12,511
             Line of credit advances (Note 6)         14,012      2,511
             Notes payable and current portion of      2,162      4,982
             long-term debt (Note 9)
             Accrued compensation and employee         6,125      5,254
             benefits
             Reserve for discontinued operations           -      1,957
             (Note 7)
             Other accrued liabilities (Note 8)       11,825      7,306
               Total current liabilities              43,852     34,521

            Long-term debt (Note 9)                   13,792     15,900
            Deferred income taxes (Note 12)            4,439      3,616
            Other liabilities                             25        196
            Commitments and contingencies (Note 14)
            Shareholders' equity (Note 9 and 10):
             Common stock, $0.01 par value
               Authorized -- 50,000,000 shares
               Issued -- 1997:  13,943,544 and 1996:
               14,193,239 shares                         140        142
             Capital in excess of par value           20,261     23,128
             Retained earnings                        80,128     71,781
             Unrealized gain on marketable
             securities (Note 3)                       2,180      2,864
             Cumulative effect of foreign currency
             translation adjustments                    (334)        28
               Total shareholders' equity             102,375    97,943
               Total liabilities and shareholders'
               equity                                $164,483  $152,176



                                   OSMONICS, INC.
                        CONSOLIDATED STATEMENTS OF CASH FLOWS
                                   (In thousands)

                                                 Year ended December 31,
                                                  1997    1996     1995
            Cash flows from operations:
              Net income                        $9,793  $13,467  $11,879
              Non-cash items included in net
              income:
                Depreciation and amortization   5,791     4,874   3,795
                Deferred income taxes           1,176     1,849     (71)
                Gain on sale of land and         (573)   (3,396)   (810)
                  investments
                Special charges                 1,448        -        -
                Recovery on discontinued       (1,947)       -        -
              operations
              Changes in assets and liabilities
              (net of business acquisitions):
                Accounts receivable             1,370    (4,648) (4,494)
                Inventories                     1,806    (3,349) (6,517)
                Other current assets              457       155    (727)
                Accounts payable and accrued
                liabilities                     (2,553)  (3,216)  5,798
                Reserve for deferred                         
                compensation                         -       -     (432)
                 Net cash provided (used) by
                 operations                     16,768   5,736    8,421

            Cash flows from investing
              activities:
              Business acquisitions (net of     (13,992)     -   (5,380)
              cash acquired)
              Purchase of investments             (902)  (1,418) (6,633)
              Maturities and sales of            2,478    9,570  13,228
              investments
              Purchase of property and          (6,609) (15,658) (20,818)
              equipment
              Sales of property and equipment      456    2,535      -
              Pending acquisition costs         (1,200)     -        -
              Other                               (245)    (169)   (367)
                 Net cash provided (used) for
                 investing activities           (20,014) (5,140) (19,970)

            Cash flows from financing
              activities:
              Proceeds from notes payable and
              current debt                      16,967     882   13,928
              Reduction of long-term debt      (10,394) (2,219)  (5,898)
              Cash restricted for purchase and
              construction  of equipment          830       74   (2,034)
              Issuance of common stock            934    1,324      761
              Purchase of common stock          (5,249)      -        -
              Dividends paid by a pooled
              company                               -        -      (90)
                 Net cash provided (used) in 
                 financing activities           3,088       61    6,667

              Effect of exchange rate changes    (362)       6      (94)
                on cash                       
            Increase (decrease) in cash and      (520)     663   (4,976)
              cash equivalents
            Cash and cash equivalents -          5,392    4,729   9,705
              beginning of year       
            Cash and cash equivalents - end of  $4,872   $5,392  $4,729
              year

                                   OSMONICS, INC.
             CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY
                                   (In thousands)
                                  
                                                          Unreal
                                                           ized
                                           Capital         Gain    Cumul-
                                              in            on     ative
                              Common Stock  Excess   Ret- Market  Transl-
                                              of    ained  able    ation
                              Common         Par    Earn- Securi  Adjust-
                              Shares  Amt.  Value   ings   ties    ments
            
             Balance -        
             January 1, 1995  13,999  $140 $21,045 $46,525 $1,038   $178

             Net income            -     -      -   11,879    -       - 

             Translation
             adjustment            -     -      -     -      -      141

             Change in
             unrealized gain       -     -      -     -    2,656      -
             on marketable
             securities
         
             Dividends of
             pooled company        -     -      -    (90)    -       -

             Employee stock
             purchase             87     1    760     -      -       -
               plans

            Balance -         14,086   141  21,805  58,314 3,694   319
             December 31,
             1995

             Net income            -     -      -   13,467   -       -

             Translation
             adjustment            -     -      -     -      -     (291)

             Change in
             unrealized gain       -     -      -     -    (830)     -
             on marketable
             securities

             Employee stock
             purchase            107     1  1,323     -      -       -
               plans


            Balance -
             December 31,     14,193   142  23,128  71,781 2,864     28 
             1996

             Net income                             9,793

             Translation
             adjustment                                            (362)

             Change in
             unrealized gain                               (684)
             on marketable
             securities

             Employee stock
             purchase             66     1    933
               plans

             Purchase of
             common stock       (316)   (3) (3,800) (1,446)


            Balance _
             December 31,     13,943  $140 $20,261 $80,128 $2,180 $(334)
             1997


                                  FIVE-YEAR RESULTS
                      (In thousands, except per share amounts)

            INCOME DATA:  (Restated for poolings-of-interests)

                                         Year ended December 31,
                                1997     1996     1995    1994     1993
            Sales            $164,905 $155,946 $130,783 $112,908 $108,212

            Income from
            continuing          8,643   13,467   11,879   10,454    9,294
            operations

            Net income          9,793   13,467   11,879   10,454    9,294

            Earnings per
            share _ basic
            (Note 16)
              Income from
              continuing
              operations        $0.60    $0.95    $0.84    $0.75    $0.67
              Net income        $0.70    $0.95    $0.84    $0.75    $0.67

            Earnings per
            share -
            assuming
              dilution
            (Note 16)
              Income from
              continuing
              operations        $0.59    $0.93    $0.83    $0.74    $0.66
              Net income        $0.68    $0.93    $0.83    $0.74    $0.66

            Average shares
            outstanding      
              Basic            14,031   14,145   14,058   13,941   13,897
              Assuming-
                dilution       14,313   14,458   14,365   14,206   14,075
    

            BALANCE SHEET DATA:  (Restated for poolings-of-interests)

            Total assets    $164,483  $152,176 $142,419 $110,715  $96,812

            Long-term debt    13,792    15,900   20,919   14,475   14,532


                                 ELEVEN-YEAR RESULTS
                      (In thousands, except per share amounts)

            SUPPLEMENTARY DATA:

            These schedules present the prior eleven-year results of the
            Company as originally reported, before restatement of prior
            period data for those acquisitions accounted for as
            poolings-of-interests, to show the effect of the Company's
            strategic acquisition activity.

            INCOME DATA:  (As Originally Reported)

<TABLE>
                                     Year ended December 31,
                    <C>      <C>      <C>      <C>      <C>     <C>     <C>     <C>     <C>     <C>     <C>   
                      1997     1996     1995     1994     1993    1992    1991    1990    1989    1988    1987
                  
            Sales   $164,905 $155,946 $111,610  $96,180 $89,043 $50,541 $46,738 $43,553 $36,223 $31,058 $20,464

            Net    
            income     9,793   13,467   11,212    9,955   7,895   4,528   3,902   3,714   4,047   2,990   1,151
 

            BALANCE SHEET DATA:  (As Originally Reported)

            Total  
            asets   $164,483 $152,176 $125,058 $102,035 $88,826 $60,300 $54,931 $54,370 $45,884 $43,430 $37,715 

            Working
            capital   45,273   54,006   54,224   55,995  45,281  29,471  25,955  21,692  21,117  15,707  13,836

            Long-
            term    
            debt      13,792   15,900   12,441   14,050  13,913  13,221  13,697  13,761   3,788   3,664   3,753

            Share-
             holders'
             equity  102,375   97,943   78,471   63,751  52,070  33,793  28,891  24,720  33,067  28,909  25,598 

            (a)       1992 Net income includes an increase in earnings of $420
               ($0.05 per share) as a result of adopting the Financial
               Accounting Standards Board Statement No. 109, "Accounting
               for Income Taxes."
</TABLE>

                              QUARTERLY FINANCIAL DATA
                      (In thousands, except per share amounts)



            Quarterly Financial Data - 1997


                                             Quarter Ended


                             March 31(b) June 30    Sept. 30    Dec. 31(b)

            Sales              $42,313   $41,789    $42,420      $38,383

            Gross profit        16,349    16,858     16,954       14,884

            Net income           2,759     2,593      2,296        2,145

            Net income per
            share _              $0.19     $0.18      $0.16        $0.15
            basic (a)

            Net income per
            share _ assuming     $0.19     $0.18      $0.16        $0.15
            dilution(a)



            Quarterly Financial Data - 1996


                                             Quarter Ended


                                March 31  June 30   Sept. 30    Dec. 31

            Sales               $39,051   $36,727    $39,493   $40,675

            Gross profit        16,024     15,225     16,246    15,928

            Net income           3,635      3,061      3,314     3,457

            Net income per
            share _              $0.26      $0.22      $0.23     $0.24
            basic(a)

            Net income per
            share _ assuming     $0.25      $0.21      $0.23     $0.24
            dilution(a)

            (a)Income per share has been restated to reflect the
               adoption of the Statements of Financial Accounting
               Standards No. 128, "Earnings per Share" (SFAS No. 128).
               See Note 16 of the consolidated financial statements.
            (b)Special charges of $1,448 ($0.07 per share after taxes)
               were recorded during the fourth quarter of 1997.
               Recovery from discontinued operations of $325 ($0.02 per
               share) and $1,005 ($0.07 per share) were recorded in
               first and fourth quarter of 1997, respectively.


                     NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

                      (Dollars in thousands, except share data)


            1. Summary of Significant Accounting Policies

               The Company is a manufacturer and marketer of high
               technology water purification, fluid filtration, fluid
               separation, and fluid transfer equipment and
               instruments, as well as the replaceable components used
               in purification, filtration, and separation equipment.
               These products are used by a broad range of industrial,
               commercial, consumer and institutional customers.

               The consolidated financial statements include the
               accounts of Osmonics, Inc. and its wholly and majority
               owned subsidiaries (the Company).  Significant
               intercompany accounts and transactions have been
               eliminated.

               Sales are recorded when the product is shipped.

               The estimated fair value for notes payable and long-term
               debt approximates carrying value due to the relatively
               short-term nature of the instruments and/or due to the
               short-term floating interest rates on the borrowing.
               The estimated fair value of notes receivable
               approximates the net carrying value, as management
               believes the respective interest rates are commensurate
               with the credit, interest rate, and repayment risks
               involved.

               The Company considers highly liquid debt instruments
               purchased with a maturity of three months or less to be
               cash equivalents.

               Inventories are stated at lower of cost (FIFO method) or
               market for all operations except for two business units
               which have historically valued inventory on the LIFO
               method.

               Depreciation and amortization of property and equipment
               are provided on the straight-line method over estimated
               lives of 3 to 40 years.

               Deferred income taxes have been provided for income and
               expenses which are recognized in different accounting
               periods for financial reporting purposes than for income
               tax purposes.

               The Company accrues for the estimated cost of warranty
               and start-up obligations at the time revenue is
               recognized.

               The Company recorded special charges of $1,448 during
               the fourth quarter of 1997.  These non-recurring charges
               of $0.07 per share after taxes assuming dilution were
               for the write-offs of certain impaired assets and
               expenses related to recent acquisitions.

               The excess of cost over the fair market value of assets
               acquired in acquisitions is amortized over not more than
               40 years.  In accordance with SFAS 121 on impairment of
               long-lived assets, the carrying values of these
               intangibles are reviewed quarterly for impairment using
               discounted cash flows when events or circumstances
               warrant such a review.  Other intangibles are carried at
               cost and amortized using the straight-line method over
               their estimated lives of 5 to 20 years.

               The preparation of financial statements in conformity
               with generally accepted accounting principles requires
               management to make estimates that affect the reported
               amounts of assets and liabilities, the disclosure of
               contingent assets and liabilities, and the reported
               amounts of revenues and expenses during the reporting
               period.  Actual results could differ from those
               estimates.

               Certain reclassifications have been made to prior year
               amounts to conform with current year presentations.

            2. Business Acquisitions

               On February 25, 1997, the Company acquired all of the
               equity interest of AquaMatic, Inc. of Rockford,
               Illinois.  The purchase price was approximately $15,000
               and included $7,600 of goodwill which is being amortized
               on the straight-line method over 40 years.  AquaMatic
               products are being sold through existing Osmonics
               distribution channels, offering a more complete line of
               specialty valves and controllers for the water treatment
               market.  Revenues of AquaMatic were less than $15,000 in
               1996 and 1995.  The acquisition was recorded under the
               purchase method of accounting.

               The results of operations of AquaMatic are included in
               the consolidated statements of income from the date of
               acquisition.

               On July 24, 1996, Desalination Systems, Inc. (DSI)
               merged with the Company through an exchange of 1,312,827
               shares of the Company's common stock for the Class A
               common stock and Class B common stock of DSI.  The
               transaction was accounted for as a pooling-of-interests.
               DSI's principal business is the manufacture of membranes
               used for reverse osmosis, nanofiltration,
               ultrafiltration and microfiltration.  The historical
               financial statements of the Company have been restated
               to give effect to the acquisition as though the
               companies had operated together from the beginning of
               the earliest period presented.  Separate results of
               operations of the combined entities for the six months
               ended June 30, 1996 and the year ended December 31, 1995
               were as follows:

                                         Six Months       Year ended
                                       ended June 30,    December 31,
                                            1996             1995
                Sales:
                  Osmonics               $ 64,405         $111,610
                  DSI                      11,642           20,348
                  Eliminations               (269)          (1,175) 
                    Combined             $ 75,778         $130,783

                Net income:
                  Osmonics                $ 5,975          $11,212
                  DSI                         721              667
                    Combined              $ 6,696          $11,879

               The eliminations represent sales between the combined
               entities prior to the combination.  The sales
               elimination had no significant effect on net income in
               the years presented.

               On October 4, 1995, the Company acquired the assets and
               operations of Western Filter Co., Denver, Colorado.  The
               purchase price was approximately $7,000 and included
               $5,780 of goodwill which is being amortized on the
               straight line method over 30 years.  Western Filter
               products are being sold through the existing Osmonics
               distribution channels, offering a more complete line of
               water and waste water treatment options.  Sales of
               Western Filter were less than $10,000 in 1995.  The
               purchase method of accounting was used.  The Company may
               be required to make additional payments of up to $2,000
               over the period ending December 1998, contingent upon
               the sales and gross margins of Western Filter Co.  Such
               additional payments would increase recorded goodwill.

               The results of operations of Western Filter are included
               in the consolidated statements of income from the date
               of acquisition.

            3. Marketable Securities

               The Company considers all of its marketable securities
               available-for-sale.  Marketable securities at December
               31, 1997 consisted of the following:


                                    Amorti   Unreal   Unreal
                                    -ized    -ized    -ized      Fair 
                                     Cost    Gains   (Losses)    Value


                U.S. government
                  securities
                  0-5 year
                  maturity         $3,835      $28    $ (15)    $3,848
                  6 year or
                  greater maturity    400        -       (1)       399

                Municipal bonds
                  0-5 year
                  maturity          3,517      175        -      3,692
                  6 year or
                  greater maturity    998       91        -      1,089

                Corporate debt
                  securities and
                  other
                  0-5 year
                  maturity            707        2       (7)       702
                  6 year or
                  greater maturity    100        4        -        104

                Equity securities    3,887    3,432    (149)      7,170

                Total before tax                          
                  effect           $13,444    3,732    (172)    $17,004

                Deferred tax
                  effect of
                  unrealized
                  (gains) losses             (1,447)     67

                Net unrealized
                  gains (losses)
                  on marketable              
                  securities                 $2,285   $(105)

            Marketable securities at December 31, 1996 consisted of the
            following:

                                    Amorti    Unreal   Unreal
                                     -zed     -ized    -ized      Fair
                                     Cost     Gains    Losses    Value


                U.S. government
                  securities
                  0-5 year
                  maturity         $3,781      $  29    $(49)   $3,761
                  6 year or
                  greater maturity    447          0     (10)      437

                Municipal bonds
                  0-5 year
                  maturity          2,836        118       -     2,954
                  6 year or
                  greater maturity  2,281        134       -     2,415

                Corporate debt
                  securities and
                  other
                  0-5 year
                  maturity            866          -     (67)      799
                  6 year or
                  greater maturity    299          -      (3)      296

                Equity securities    3,897     4,612    (143)     8,366
                                                               
                Total before tax   $14,407     4,893    (272)   $19,028
                  effect

                Deferred tax
                  effect of
                  unrealized
                  (gains) losses             (1,860)     103

                Net unrealized
                  gains (losses)
                  on
                  marketable               
                  securities                 $3,033    $(169)

               Market values are based on quoted market prices.

               In 1997, proceeds from sales of available-for-sale
               securities were $1,678.  The gains and losses on these
               sales were $614 and $41, respectively, determined on the
               specific identification method.

               In 1996, proceeds from sales of available-for-sale
               securities were $8,068.  The gains and losses on these
               sales were $2,832 and $44, respectively, determined on
               the specific identification method.

            4. Inventories

               Inventories consist of the following:

                                                      December 31,

                                                   1997          1996

                Finished goods                  $  9,757       $ 5,276
                Work in process                    7,544         9,319
                Raw materials                     19,832        18,416
                                                  37,133        33,011
                Adjustment to reduce
                  inventories of $12,446 and
                  $6,016 to the last-in,          (1,905)        (689)
                  first-out method (See Note
                  1)                                  
                                                 -------       -------
                                                 $35,228       $32,322

            5. Restricted Cash

               Cash restricted for purchase and construction of
               equipment at December 31, 1997 and 1996 represents
               proceeds received from the issuer of Industrial
               Development Revenue Bonds (see Note 9) restricted to the
               purchase and construction of property and equipment used
               in the Company's operations.

            6. Line of Credit

               The Company, at December 31, 1997, had an unsecured
               revolving line of credit of $22,000 for working capital
               needs.  The revolving line of credit matures on October
               8, 1998 and borrowings bear a variable interest rate
               related to LIBOR.  The terms of the credit agreement
               contain certain restrictions related to financial
               ratios, indebtedness, tangible net worth and capital
               expenditures.  As of December 31, 1997 and 1996, the
               Company was in compliance with all debt covenants.  At
               December 31, 1997, the Company had borrowings
               outstanding under the line of $14,000, and the interest
               rate was 6.27%.  At December 31, 1996, the Company had
               borrowings outstanding under the line of $2,511, and the
               interest rate was 6.19%.

            7. Discontinued Operations

               In September 1982, Autotrol Corporation (Autotrol),
               which has since been merged with the Company,
               discontinued its wastewater business.  In subsequent
               years Autotrol incurred certain expenses related to the
               wastewater products and accrued for contingent
               liabilities.  The Company determined in 1997 that the
               reserve was no longer required and recognized $1,330
               ($0.09 per share.assuming dilution) of after-tax income
               as a recovery on discontinued operations.

            8. Other Accrued Liabilities

               Other accrued liabilities consist of the following:


                                                   December 31,

                                                 1997         1996

                Warranty and start-up          $1,900       $1,802
                Professional fees and other     2,123        2,480
                accruals
                Deferred acquisition            3,000            -
                payments
                Customer deposits               4,802        3,024
                                              -------       ------
                                              $11,825       $7,306
                       

            9. Debt

               Long-term debt is as follows:

                                                     December 31,

                                                   1997        1996
                Promissory notes; interest
                  payable quarterly at the
                  three month LIBOR rate plus
                  80 b.p.; due through 2001.     $7,150      $ 8,575
                  The interest rate on
                  December 31, 1997 was 6.52%.

                Industrial development revenue
                  bonds (IDRB's), principal
                  due in varying annual
                  payments over 30 years;
                  interest payable monthly at
                  a variable rate determined      7,950        8,270
                  periodically by the bond
                  remarketing agent (6.61% at
                  December 31, 1997).

                Industrial revenue bonds
                  (IRB's); paid in 1997.              -        2,800

                Mortgage notes payable to two
                  French banks; interest
                  payable monthly at PIBOR
                  plus 40 b.p.  The interest        502          727
                  rate on  December 31, 1997
                  was 3.57%.

                Other notes                         352          510
                                                 ------       ------
                                                 15,954       20,882

                Current portion                  (2,162)      (4,982) 
                                                -------      -------
                                                $13,792      $15,900

               The IDRB debt and mortgage notes payable to French banks
               are collateralized by real and personal property of the
               Company.

               Aggregate maturities of long-term debt outstanding at
               December 31, 1997 are:

               1998 - $2,162; 1999 - $2,159; 2000 - $2,250; 2001 -
               $3,700; 2002 - $834; beyond 2002 - $4,849.
                                        
               The interest rate on the IRB's was determined in part by
               the amount of collateral held by the lender.  At
               December 31, 1996, $2,000 of collateral was held by the
               lender, resulting in an interest rate of LIBOR plus 45
               b.p.  The $2,000 of collateral is included in marketable
               securities.

               The promissory notes contain a covenant which limits the
               payment of dividends to shareholders.  At December 31,
               1997, approximately $38,901 of retained earnings were
               restricted under this covenant.  In addition, the
               Company's various debt agreements contain certain
               restrictions related to financial ratios, indebtedness,
               tangible net worth and capital expenditures.  As of
               December 31, 1997 and 1996, the Company was in
               compliance with all debt covenants.

               Cash payments for interest related to all debts of the
               Company were $2,033, $1,551, and $1,409, for the years
               ended December 31, 1997, 1996, and 1995, respectively.

            10.Stock Options

               At December 31, 1997, the Company had reserved no common
               shares for issuance to key employees under a 1983 stock
               option plan.  Options were issued at a price not less
               than market value on the date of grant and became
               exercisable over a five-year period, after which they
               expired.  The following is a summary of activity under
               the 1983 stock option plan.  No additional options can
               be granted under the 1983 plan.

                                             1997     1996     1995

                 Options held by
                  employees
                  at December 31              -     7,500    86,206
                 Exercise price range on      -     $10.50   $ 6.45
                                                    to       to
                  options held at             -     $10.50   $13.50
                  December 31

                 Number of options
                  exercised
                  during the year          7,500    65,805   34,920

                 Price range of options    $10.50   $  6.45  $ 3.63
                   Exercised during the    to       to       to
                   year                    $10.50   $13.50   $10.16

                 Exercisable options held
                  at December 31              -     7,500    84,330

                 Exercise price range of      -     $10.50   $  6.45
                   Exercisable options              to       to
                                              -     $10.50   $13.50

               The Company also has reserved 298,863 common shares at
               December 31, 1997 for issuance to key employees under a
               1993 Stock Option Plan.  Options are granted at a price
               not less than market value on the date of the grant and
               become exercisable over a period of up to ten years,
               after which they expire.  The following is a summary of
               activity under the 1993 Stock Option Plan.

                                             1997     1996    1995

                Options held by employees
                  at December 31           177,588  50,200  34,163

                Exercise price range on    $13.67   $13.67  $13.67
                  Options held at          to       to      to
                  December 31              $22.38   $22.38  $18.25

                Number of options
                  exercised
                  during the year          187      263     500

                Price range of options     $13.67   $13.67  $14.38
                  Exercised during the     to       to      to
                  year                     $17.50   $14.38  $14.38

                Exercisable options held
                  at December 31           20,513   10,687  2,463

                Exercise price range of    $13.67   $13.67  $13.67
                  Exercisable options      to       to      to
                                           $22.38   $18.25  $14.50

               Desalination Systems, Inc. (DSI), a pooled company (Note
               2), has a stock option plan for which 371,841 shares of
               the Company's common stock are reserved.  Options issued
               under the plan vest in varying periods of up to 5 years
               and expire on various dates through March 2003.  The
               following is a summary of activity under the plan.  No
               additional options can be granted under the DSI plan.

                                             1997     1996    1995

                 Options held by
                  employees
                  at December 31         371,841  371,841  371,841
                                                    
                 Exercise price range on   $3.18    $3.18   $3.18
                   Options held at         to       to      to
                   December 31             $6.94    $6.94   $6.94

                 Number of options
                  exercised
                  during the year          -        -       14,407

                 Price range of options
                  exercised during the     -        -       $3.47
                  year

                 Exercisable options held
                  at December 31          368,958  360,315  351,672

                 Exercise price range of   $3.18    $3.18   $3.18
                  exercisable options      to       to      to
                                           $6.94    $6.94   $6.94

               The Company also had a 1985 Employee Stock Purchase
               Plan.  In 1995, 14,548 shares were issued under the 1985
               Plan at an average price of $13.58.  No additional
               shares may be issued under the 1985 Plan.

               The 1985 Plan was superseded by the 1995 Employee Stock
               Purchase Plan, approved by the shareholders at the 1995
               Annual Meeting and effective June 1, 1995.  Employees
               may purchase common shares of the Company at 85% of
               market price.  In 1997 and 1996, 58,720 and 41,154
               shares were issued, respectively, under the 1995 Plan at
               an average price per share of $14.48 and $17.41,
               respectively.  At December 31, 1997, 277,946 shares
               remain unissued in the 1995 Plan.

               In 1993, the Company granted a director an option to
               purchase 45,000 shares of common stock at an exercise
               price of $12.33 per share.  This option vests over a
               five-year period.

               In 1995, the Board of Directors adopted a 1995 Director
               Stock Option Plan.  The plan provides that each director
               of the Company shall automatically receive, as of the
               date of each Annual Meeting of Shareholders, a non-
               qualified option to purchase 3,000 shares of the
               Company's common stock.  The options have a ten-year
               term and are exercisable one year after the grant date
               at an exercise price equal to the fair market value of
               the shares on the grant date.  In 1997, options to
               purchase 21,000 shares at a price ranging from $15.38 to
               $16.81 were issued under this plan.  In 1996, options to
               purchase 18,000 shares at a price of $19.88 were issued
               under this plan.  In 1995, options to purchase 18,000
               shares at a price of $17.13 were issued under this plan.
               At December 31, 1997, 18,000 options were exercisable
               under this plan at a price of $19.88 and 18,000 options
               were exercisable at a price of $17.13.

               The Company applies APB Opinion No. 25 "Accounting for
               Stock Issued to Employees" and related interpretations
               in accounting for its plans.  No compensation cost has
               been recognized for its stock-based compensation plans
               as the exercise price of the stock option grants was
               equal to the fair market value of the shares on the
               grant date.  Had compensation costs been determined
               based on the fair value of the 1997, 1996 and 1995 stock
               option grants consistent with the requirements of SFAS
               No. 123 "Accounting for Stock-Based Compensation" (FAS
               123), there would have been less than a $0.01 per share
               effect on the Company's pro forma net income per share
               for 1997, 1996 or 1995.  The fair value of options
               granted under the Company's stock option plans during
               1997, 1996 and 1995 was estimated using the Black-
               Scholes option-pricing model with the following
               weighted-average assumptions used:  no dividend yield,
               expected volatility between 22.6% and 25.0%, risk-free
               interest rates between 6.0% and 6.1% and expected lives
               of 5 years.

               The Company had 500,000 authorized and unissued shares
               of preferred stock at December 31, 1997 and 1996.

            11.Income Taxes

               Income tax expense consists of:
                                               Year ended December 31,

                                                1997      1996     1995
                Current:
                  Federal                     $2,741    $3,556   $3,975
                  State                          (39)      395      423
                  Foreign                        666       640      372
                Deferred:
                  Depreciation                   351       370      130
                  Valuation allowance
                    adjustment                     -         -     (197)
                  Allowance for doubtful
                    accounts, start-up,
                    warranty, inventory and
                    other accruals               100       462      310
                  Other                          108     1,018     (462)
                                              ------    ------   ------
                  Total continuing
                    operations                $3,927    $6,441   $4,954
                  Discontinued operations,
                    deferred                     617         -     (228)
                                              ------    ------   ------
                  Total provision             $4,544    $6,441   $4,679

               Cash payments for income taxes were $3,728, $5,204, and
               $5,079, for the years ended December 31, 1997, 1996, and
               1995, respectively.

               A reconciliation of the income taxes computed at the
               Federal statutory rate to the Company's income tax
               expense is as follows:

                                               Year ended December 31,

                                                1997      1996     1995

                Taxes at Federal rate (35%)   $4,337    $6,950   $5,563
                Increase (decrease)
                  resulting from:
                Valuation allowance
                  adjustment                       -        -      (197)
                State taxes, net of Federal
                  tax benefit                    132       397      203
                Foreign Sales Corp. benefit     (546)     (361)    (190)
                Tax credits                     (249)     (197)    (271)
                Tax exempt
                  interest/dividend
                  deduction                     (123)     (128)    (200)
                Effect of foreign
                  affiliates with different
                  tax rates or net losses        167        30      245
                NOL and credit
                  carryforwards used               -         -     (274)
                Uncollectible account
                  write-off                        -      (442)      -
                Other                            209       192     (200)
                                               ------    ------  ------
                Total continuing operations   $3,927    $6,441   $4,679
                Discontinued operations          617         -        -
                                              ------    ------   ------
                Total provision               $4,544    $6,441   $4,679

            12.Deferred Tax Assets and Liabilities

               Temporary differences which give rise to deferred tax
               assets and liabilities are as follows as of December 31:

                                                1997      1996
                 Current assets:
                  Allowance for doubtful
                    accounts, start-up,
                    warranty, inventory and   $2,955     $3,627
                    other accruals
                  Unrealized gain on
                    marketable securities     (1,380)    (1,757)
                  Inventory costs                 81        115
                    capitalized for tax
                  Other                         (243)      (426)
                                              ------     ------
                  Total current deferred      $1,413     $1,559
                    assets

                 Noncurrent liabilities:
                  Depreciation                $3,718     $3,130
                  Other                          721        486
                                              ------     ------
                  Total non-current deferred                   
                    tax liabilities           $4,439     $3,616

            13. Sales and Segment Information

               All continuing operations for which geographic data is
               presented below are in one principal industry (design,
               manufacture and marketing of machines, systems,
               instruments and components used in the processing of
               fluids).

                                               1997      1996     1995

                 Sales to unaffiliated
                  customers from:

                  United States              $150,753 $141,124 $116,964
                  Foreign operations           14,152   14,822   13,819

                 Transfers from (to)
                  geographic areas:

                  United States                 7,818   7,890     7,936
                  Foreign operations           (7,818) (7,890)   (7,936)
                                 
                                             $164,905 $155,946 $130,783

                 Income from continuing
                  operations before income
                  taxes:

                  United States               $10,847  $18,225  $16,190
                  Foreign operations            1,543    1,683      643
 
                                              $12,390  $19,908  $16,833

                 Identifiable assets:

                  United States              $155,592 $144,609 $134,408
                  Foreign operations            8,891    7,567    8,011
                                            
                                             $164,483 $152,176 $142,419

               NOTE:  Transfers are made at market value.
                                        
               Sales by United States operations to unaffiliated
               customers in foreign geographic areas are as follows:

                                           Year ended December 31,

                                         1997       1996       1995

                 Asia/Pacific          $18,643    $14,661     $10,915
                 Europe                 13,752      9,181       7,798
                 Rest of the World      13,849      9,222       9,641
                                       -------    -------     -------
                                       $46,244    $33,064     $28,354

               Total international sales for the Company were as
               follows:
              
               1997 - $60,396; 1996 - $47,886; and 1995 - $42,173.

            14.Commitments and Contingencies

               The Company leases facilities for sales, service or
               manufacturing purposes in Wisconsin, Massachusetts,
               California, Florida, Iowa, Switzerland, Hong Kong,
               Japan, Singapore, and Thailand.

               Future minimum lease payments on all operating leases of
               $5,291 are payable as follows:  1998 - $1,512; 1999 -
               $1,108; 2000 - $964; 2001 - $743; 2002 - $604; and
               beyond 2002 - $360.  Rent expense for the three years
               ended December 31 was:  1997 - $1,633; 1996 - $1,100;
               and 1995 - $1,718.

               The Company is involved in certain legal actions arising
               in the ordinary course of business.  In the opinion of
               management, based on the advice of legal counsel, such
               litigation and claims will be resolved without a
               material effect on the Company's financial position or
               results of operations.

            15.Employee Benefit Plans

               The Company has a noncontributory discretionary profit
               sharing plan covering certain employees meeting age and
               length of service requirements.  The Company contributes
               annually to the plan an amount established at the
               discretion of the Board of Directors.

               Total expense recognized by the Company under these
               plans amounted to $1,300, $1,435, and $996 in 1997,
               1996, and 1995, respectively.

            16.Earnings Per Share
                                        
               Effective December 31, 1997, the Company adopted
               Statement of Financial Accounting Standards No. 128,
               "Earnings per Share" (SFAS No. 128).  Earnings per share
               amounts presented for 1996 and 1995 have been restated
               for the adoption of SFAS No. 128.  The following table
               reflects the calculation of basic and diluted earnings
               per share from continuing operations.

                                                 1997     1996    1995
                Earnings per share - basic
                Income from continuing
                operations available
                to common stockholders          $8,463  $13,467 $11,879
                Weighted average shares
                outstanding                     14,031   14,145  14,058
                Income from continuing
                operations per share                                
                  -  basic                       $0.60    $0.95   $0.84

                Earnings per share _ assuming
                dilution
                Income from continuing
                operations available
                to common stockholders         $8,463  $13,467  $11,879
                Weighted average shares
                outstanding                    14,031   14,145   14,058
                Dilutive impact of stock
                options outstanding               282      313      307
                Weighted average shares and
                potential dilutive shares
                outstanding                    14,313   14,458   14,365
                Income from continuing
                operations per share           
                  - assuming dilution           $0.59    $0.93    $0.83

               Options to purchase 128,800 shares of common stock at a
               range of $17.50 to $22.38 were outstanding during 1997
               but were not included in the computation of diluted
               earnings per share because the options' exercise price
               was greater than the average market price of the common
               share.

            17.Subsequent Events

               On February 17, 1998, the Company completed the purchase
               of all of the equity interest in Micron Separations,
               Inc. (MSI) of Westborough, Massachusetts, for a total
               consideration of approximately $25,000.  MSI's product
               will be sold through existing Osmonics distribution
               channels, offering a more complete line of microfilter
               membrane products for diagnostic, laboratory and
               industrial use.  The revenues of MSI were less than
               $15,000 in each of the last three years.  The
               acquisition will be recorded under the purchase method
               of accounting.

               On March 20, 1998, the Company signed a definitive
               agreement to purchase all of the equity interest in
               Membrex Corp. of Fairfield, New Jersey, subject to
               Membrex shareholder approval.  The acquired products
               give the Company the most hydrophilic UF membrane in the
               market, which is used to separate oil from water in a
               variety of applications, including biotechnology,
               laboratory and chemical processes.

               Effective March 18, 1998, the Company expanded its
               financing arrangements in the form of a $30,000
               revolving line of credit from a commercial bank, and
               $20,000 of long-term loans from an insurance company.
               The long-term loans include $5,000 at a fixed rate of
               6.72%.  The balance of the financing is at floating
               rates that could vary from 30 to 150 basis points over
               the 90-day LIBOR.

                                  


                                                            EXHIBIT (21)

                           SUBSIDIARIES OF OSMONICS, INC.

            Percentage
            Ownership

              100%  VAPONICS, INC.               A Massachusetts Corp.

              100%  AQUA MEDIA INTERNATIONAL     A Delaware Corporation

              100%  PORETICS CORPORATION         A Delaware Corporation

              100%  OSMONICS ASIA/PACIFIC LTD.   A Hong Kong Corporation

              100%  OSMONICS EUROPA, S.A.        A Switzerland Corp.

              100%  OSMONICS INTERNATIONAL LTD.  A Jamaica Corporation

              100%  OSMONICS INTERNATIONAL, INC. A Minnesota Corporation

              100%  OZONE RESEARCH & 
                    EQUIPMENT CORP.              An Arizona Corporation

              100%  GHIA, INC.                   A Nevada Corporation

              100%  AUTOTROL CORPORATION         A Wisconsin Corporation

              100%  NIPPON OSMONICS LTD.         A Japan Corporation

              100%  AUTOTROL S.A.                A France Corporation

              100%  OSMONICS INT'L SALES CORP.   A Virgin Is. Corp.

              100%  MICROL SYSTEMS, LTD.         An England Corporation

              100%  PETECO CORPORATION           A Minnesota Corporation

              100%  DESALINATION SYSTEMS, INC.   A California Corp.

              100%  DESALINATION SYSTEMS
                    INTERNATIONAL INC.           A Virgin Islands Corp.

               50%  NIPPON AUTOTROL K.K.         A Japan Corporation

              100%  AQUAMATIC, INC.              A Delaware Corporation<PAGE>



            INDEPENDENT AUDITORS CONSENT

            Osmonics, Inc.

            We consent to the incorporation by reference in Registration
            Statements No. 33-25228 and No. 33-537 of Osmonics, Inc. on
            Form S-8 and Registration Statement No. 33-05029 filed on 
            Form S-3 of our reports dated February 19, 1998 (March 20, 1998
            as to Note 17) appearing and incorporated by reference in this
            Annual Report on Form 10-K of Osmonics, Inc. for the year 
            ended December 31, 1997.


            DELOITTE AND TOUCHE


            Minneapolis, Minnesota
            MARCH 26, 1998

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from Form 10-K
for the year ended December 31, 1997, and is qualified in its entirety by
reference to such financial statements.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               DEC-31-1997
<CASH>                                            4872
<SECURITIES>                                     17004
<RECEIVABLES>                                    29857
<ALLOWANCES>                                       888
<INVENTORY>                                      35228
<CURRENT-ASSETS>                                 89125
<PP&E>                                           97583
<DEPRECIATION>                                   42550
<TOTAL-ASSETS>                                  164483
<CURRENT-LIABILITIES>                            43852
<BONDS>                                          13792
                                0
                                          0
<COMMON>                                           140
<OTHER-SE>                                      102235
<TOTAL-LIABILITY-AND-EQUITY>                    164483
<SALES>                                         164905
<TOTAL-REVENUES>                                164905
<CGS>                                            99860
<TOTAL-COSTS>                                    99860
<OTHER-EXPENSES>                                 51686
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                2226
<INCOME-PRETAX>                                  12390
<INCOME-TAX>                                      3927
<INCOME-CONTINUING>                               8463
<DISCONTINUED>                                    1330
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                      9793
<EPS-PRIMARY>                                      .70
<EPS-DILUTED>                                      .68
        

</TABLE>




                        OSMONICS, INC. AND SUBSIDIARIES
                       VALUATION AND QUALIFYING ACCOUNTS
                                 (In thousands)

                  Years Ended December 31, 1997, 1996 and 1995

                  Column A         Column B    Column C   Column D  Column E
               
                                               Additions

                                    Balance Charged Charged          Balance
                                    At Beg. to Cost   to                at
                                      of      and    Other  Deduct-   End of
                                    Period  xpensed  Accts   ions     Period
                 Description

          Year Ended Dec. 31, 1997:

           Current Operations:

           Allowance for Doubtful

            Accounts                 $ 907   $ 139           $ 158    $  888

           Warranty and Start-up 

            Reserve                 $1,802  $2,343          $2,245    $1,900



           Discont. Operations:

           Warranty Reserve          $1,957                 $1,957(D)    $0



          Year Ended December 31,

          1996:

           Current Operations:

           Allowance for Doubtful    

            Accounts                 $1,177    $   59       $  329(A) $  907

           Warranty and Start-up    

            Reserve                  $1,868    $2,414       $2,480(B) $1,802



           Discont. Operations:

           Warranty Reserve          $1,957                           $1,957


          Year Ended December 31,

          1995:

           Current Operations:

           Allowance for Doubtful

            Accounts                 $1,329   $  80  $109(C) $ 341(A) $1,177

           Warranty and Start-up 

            Reserve                  $1,981  $1,406          $1,519   $1,868



           Discont. Operations:

           Allowance for Doubtful             

            Accounts                  $  46                  $ 46(A)  $    0

           Warranty Reserve          $1,961                  $  4(B)  $1,957

           Reserve for   Discont.

            Operations               $  127                  $  127   $    0

                             

          (A)       Uncollectible accounts charged against allowance.

          (B)       Actual warranty claims and start-up costs charged against  

                    reserve.

          (C)       Addition due to acquisition.

          (D)       Company determined that the reserve was no longer required.

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from Form 10-K
for the year ended December 31, 1997 and is qualified in its entirety by
reference to such financial statements.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>                     <C>                     <C>
<PERIOD-TYPE>                   YEAR                   YEAR                   3-MOS                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1996             DEC-31-1995             MAR-31-1996             JUN-30-1996
<PERIOD-START>                             JAN-01-1996             JAN-01-1995             JAN-01-1996             APR-01-1996
<PERIOD-END>                               DEC-31-1996             DEC-31-1995             MAR-31-1996             JUN-30-1996
<CASH>                                            5392                    4729                    2346                    2160
<SECURITIES>                                     19028                   26307                   23119                   20907
<RECEIVABLES>                                    29107                   24729                   20794                   20752
<ALLOWANCES>                                       907                    1177                     878                     884
<INVENTORY>                                      32322                   28973                   26226                   28059
<CURRENT-ASSETS>                                 88527                   87749                   77490                   76965
<PP&E>                                           86126                   73087                   66138                   68369
<DEPRECIATION>                                   34332                   30598                   28596                   29445
<TOTAL-ASSETS>                                  152176                  142419                  125027                  125732
<CURRENT-LIABILITIES>                            34521                   34055                   25961                   24749
<BONDS>                                          15900                   20919                   12473                   12441
                                0                       0                       0                       0
                                          0                       0                       0                       0
<COMMON>                                           142                     141                     129                     129
<OTHER-SE>                                       97801                   84132                   81411                   83699
<TOTAL-LIABILITY-AND-EQUITY>                    152176                  142419                  125027                  125732
<SALES>                                         155946                  130783                   33229                   31176
<TOTAL-REVENUES>                                155946                  130783                   33229                   31176
<CGS>                                            92523                   74670                   19667                   18228
<TOTAL-COSTS>                                    92523                   74670                   19667                   18228
<OTHER-EXPENSES>                                 46016                   40776                    9206                    9695
<LOSS-PROVISION>                                     0                       0                       0                       0
<INTEREST-EXPENSE>                                1594                    1565                     236                     234
<INCOME-PRETAX>                                  19908                   16833                    4582                    4078
<INCOME-TAX>                                      6441                    4954                    1420                    1265
<INCOME-CONTINUING>                              13467                   11879                    3162                    2813
<DISCONTINUED>                                       0                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0                       0
<CHANGES>                                            0                       0                       0                       0
<NET-INCOME>                                     13467                   11879                    3162                    2813
<EPS-PRIMARY>                                      .95                     .84                     .26                     .22
<EPS-DILUTED>                                      .93                     .83                     .25                     .21
        

</TABLE>


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