IONICS INC
11-K/A, 1994-05-31
SPECIAL INDUSTRY MACHINERY, NEC
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<PAGE>


                             FORM 10-K/A

                AMENDMENT TO FORM 10-K ANNUAL REPORT

                 SECURITIES AND EXCHANGE COMMISSION

                        Washington, DC 20549

                           AMENDMENT NO. 1

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

For the fiscal year ended   December 31, 1993          

                                 OR

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

For the transition period ended___________________________

Commission File Number              1-7211                

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

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

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

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


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

   Title of each class      Name of each exchange on which registered

Common Stock, $1 par value           New York Stock Exchange        


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

                                None                                
                          (Title of Class)

<PAGE>





    The undersigned registrant hereby amends the following items,
financial statements, exhibits or other portions of its Annual Report
on Form 10-K for the fiscal year ended December 31, 1993 as set forth
in the pages attached hereto:

1.  Item 14(a) 3. of Part IV of said report on Form 10-K is amended to
list Form 11-K, Annual Report of the Ionics Section 401(k) Stock
Savings Plan for the year ended December 31, 1993, as Exhibit 28
thereto.  The Annual Report of the Ionics Section 401(k) Stock Savings
Plan on Form 11-K for the year ended December 31, 1993 is hereby filed
pursuant to rule 15d-21 and General Instruction F to Form 10-K as an
Exhibit to said Annual Report on Form 10-K.

    Pursuant to the requirements of the Securities Exchange Act of
1934, the registrant has duly caused this amendment to be signed on
its behalf by the undersigned, thereunto duly authorized.

                                     IONICS, INCORPORATED
                                     (Registrant)



Date:  May 27, 1994                  By /s/Stephen Korn            
                                        Stephen Korn
                                        Vice President and
                                        General Counsel


                                     
<PAGE>


                                  PART IV

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

(a)  1.   Financial Statements

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

     2.   Financial Statement Schedules

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

     3.   Exhibits

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

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

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

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

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

     4.0      Instruments defining the rights of security holders,
              including indentures

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

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






                                   IV-1

<PAGE>


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

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

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

     10.      Material Contracts

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

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

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

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

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

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

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




                                   IV-2
<PAGE>




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

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

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

     11.      Statement re Computation of Earnings Per Share.

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

     22.      Subsidiaries of the Registrant.

     24.      Consents

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

     25.      Power of Attorney.

     28.      Form 11-K Annual Report of the Ionics Section 401(k)
              Stock Savings Plan for the year ended December 31, 1993.
________________________________

     *   incorporated herein by reference

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


                                   IV-3
<PAGE>




            Exhibit No. 28 to Annual Report on Form 10-K
    of Ionics, Incorporated for the year ended December 31, 1993





                 SECURITIES AND EXCHANGE COMMISSION

                       WASHINGTON, D.C. 20549


                              FORM 11-K




(Mark One)

[X]  Annual report pursuant to Section 15(d) of the Securities
     Exchange Act of 1934 (Fee Required)

For the fiscal year ended ________December 31, 1993        _________

                                 OR

[ ]  Transition report pursuant to Section 15(d) of the Securities
     Exchange Act of 1934 (No Fee Required)

For the transition period from _________ to _________

Commission file number   1-7211  



        A.  Full title of the plan and the address of the plan, if
different from that of the issuer named below:

              Ionics Section 401(k) Stock Savings Plan

        B.  Name of issuer of the securities held pursuant to the plan
and the address of its principal executive office:

                        IONICS, INCORPORATED

                           65 Grove Street

                   Watertown, Massachusetts  02172







<PAGE>








                    INDEX TO FINANCIAL STATEMENTS



                                                               Page

    Report of Independent Accountants                             2

    Statements of Financial Condition                          3- 4

    Statements of Income and Changes in Plan Equity            5- 7

    Notes to Financial Statements                              8-10

    Signatures                                                   11

    Exhibit 1 - Consent of Independent Accountants               12

































                                 -1-

<PAGE>






                  REPORT OF INDEPENDENT ACCOUNTANTS

To the Board of Directors of Ionics, Incorporated and the
Administrators of the Ionics Section 401(k) Stock Savings Plan:

    We have audited the accompanying statements of financial condition
of the Ionics Section 401(k) Stock Savings Plan as of December 31,
1993 and 1992 and the related statements of income and changes in plan
equity for each of the three years in the period ended December 31,
1993.  These financial statements are the responsibility of the Plan's
management.  Our responsibility is to express an opinion on these
financial statements based on our audits.

    We conducted our audits in accordance with generally accepted
auditing standards.  Those standards require that we plan and perform
the audit to obtain reasonable assurance about whether the financial
statements are free of material misstatement.  An audit includes
examining, on a test basis, evidence supporting the amounts and
disclosures in the financial statements.  An audit also includes
assessing the accounting principles used and significant estimates
made by management, as well as evaluating the overall financial
statement presentation.  We believe that our audits provide a
reasonable basis for our opinion.

    In our opinion, the financial statements referred to above present
fairly, in all material respects, the financial condition of the
Ionics Section 401(k) Stock Savings Plan at December 31, 1993 and 1992
and the income and changes in plan equity for each of the three years
in the period ended December 31, 1993, in conformity with generally
accepted accounting principles.








                                      Coopers & Lybrand

Boston, Massachusetts
May 18, 1994














                                 -2-
<PAGE>
<TABLE>
 

                                  IONICS, INCORPORATED SECTION 401(k) STOCK SAVINGS PLAN               
                                            STATEMENTS OF FINANCIAL CONDITION                          
                                                                                                       
<CAPTION>                                                                                                       
                                            IONICS, INC.   EQUITY         CASH                            
                                              COMMON      INCOME       RESERVES     PURITAN              
                                            STOCK FUND     FUND          FUND        FUND          TOTAL
  <S>                                       <C>           <C>          <C>          <C>            <C>
  DECEMBER 31, 1993                                                                                    
                            
  ASSETS:                                                                                              
  INVESTMENTS, AT MARKET (SEE NOTE 2):                                                                 
     IONICS, INCORPORATED COMMON STOCK:                                                                
     127,379 SHARES @ $49.625 PER SHARE                                                                
      (COST $3,174,341)                      $6,321,183                                           $6,321,183
                                                                                                       
     FIDELITY INVESTMENTS:                                                                             
       EQUITY INCOME FUND:                                                                             
       29,735.54 SHARES @ $33.84 PER SHARE                                                             
        (COST $809,176)                                    $1,006,251                              1,006,251
                                                                                                       
       CASH RESERVES:                                                                                  
       242,898.05 SHARES @ $1.00 PER SHARE                                                             
        (COST $242,898)                                                 $242,898                     242,898
                                                                                                       
       PURITAN FUND:                                                                                   
       43,121.96 SHARES @ $15.75 PER SHARE                                                             
        (COST $619,726)                                                              $679,171        679,171
                                                                                                       
  CASH AND CASH EQUIVALENTS                      60,767        11,852      3,489        9,464         85,572
                                                                                                       
  ACCRUED INCOME                                     78             5          1            4             88
                                                                                                       
  RECEIVABLE FROM IONICS, INCORPORATED                                                                 
     AND PLAN PARTICIPANTS                       40,949         5,921      1,480        6,349         54,699
                                             $6,422,977    $1,024,029   $247,868     $694,988     $8,389,862
                                                                                                       
  PLAN EQUITY                                $6,422,977    $1,024,029   $247,868     $694,988     $8,389,862
                                                                                                       
  THE ACCOMPANYING NOTES ARE AN INTEGRAL PART OF THESE FINANCIAL STATEMENTS.                           
                                                                                                       
                                                                                                       
                                                                                                       
                                                                                                       
                                                                                                       
                                                                                                       
                                                                                                       
                                                                                                       
                                                                                                       
                                                                                                       
                                                                                                       
                                                                                                  

                                                         -3- 
</TABLE>
<PAGE>
<TABLE>
                                                                                                       
                                  IONICS, INCORPORATED SECTION 401(k) STOCK SAVINGS PLAN               
                                            STATEMENTS OF FINANCIAL CONDITION                          
                                                        (CONTINUED)                                    
<CAPTION>                                                                                                       
                                                                                                       
                                            IONICS, INC.   EQUITY        CASH
                                              COMMON       INCOME       RESERVES     PURITAN
                                            STOCK FUND      FUND          FUND         FUND         TOTAL
  <S>                                       <C>            <C>          <C>          <C>            <C>                  
  DECEMBER 31, 1992
 
  ASSETS:                                                                                              
  INVESTMENTS, AT MARKET (SEE NOTE 2):                                                                 
     IONICS, INCORPORATED COMMON STOCK:                                                                
     115,435 SHARES @ $67.875 PER SHARE                                                                
      (COST $2,504,795)                     $7,835,151                                            $7,835,151
                                                                                                       
     FIDELITY INVESTMENTS:                                                                             
       EQUITY INCOME FUND:                                                                             
       25,834 SHARES @ $29.01 PER SHARE                                                                
        (COST $679,573)                                    $749,443                                  749,443
                                                                                                       
       CASH RESERVES:                                                                                  
       270,843 SHARES @ $1.00 PER SHARE                                                                
        (COST $270,843)                                                  $270,843                    270,843
                                                                                                       
       PURITAN FUND:                                                                                   
       31,541.81 SHARES @ $14.74 PER SHARE                                                             
        (COST $432,050)                                                              $464,926        464,926
                                                                                                       
  CASH AND CASH EQUIVALENTS                     52,487        8,919         3,295       6,421         71,122
                                                                                                       
  ACCRUED INCOME                                    75            8             2           7             92
                                                                                                       
  RECEIVABLE FROM IONICS, INCORPORATED                                                                 
     AND PLAN PARTICIPANTS                      36,571        7,051         3,097       2,584         49,303
                                            $7,924,284     $765,421      $277,237    $473,938     $9,440,880
                                                                                                       
  PLAN EQUITY                               $7,924,284     $765,421      $277,237    $473,938     $9,440,880


  THE ACCOMPANYING NOTES ARE AN INTEGRAL PART OF THESE FINANCIAL STATEMENTS.                           
                                                                                                       
                                                                                                       
                                                                                                       
                                                                                                       
                                                                                                       
                                                                                                       
                                                                                                       
                                                                                                       
                                                                                                       
                                                                                                       
                                                                                                       
                                                                                                  


                                                         -4- 
</TABLE>
<PAGE>
<TABLE>
                             IONICS, INCORPORATED SECTION 401(k) STOCK SAVINGS PLAN                    
                                 STATEMENTS OF INCOME AND CHANGES IN PLAN EQUITY                       
                                                                                                       
<CAPTION>

                                            IONICS, INC.                 EQUITY       CASH                            
                                               COMMON      INCOME       RESERVES     PURITAN              
                                             STOCK FUND     FUND          FUND        FUND          TOTAL
  <S>                                       <C>            <C>          <C>          <C>            <C>
  YEAR ENDED DECEMBER 31, 1993
                                                                         
  PLAN EQUITY- BEGINNING OF YEAR            $ 7,924,284    $  765,421   $277,237     $473,938     $ 9,440,880
  NET INVESTMENT INCOME, PRINCIPALLY                                                                   
    INTEREST AND DIVIDENDS                        2,167        32,080      8,234       25,554          68,035 
                                                                                                       
  REALIZED NET CAPITAL GAINS                                                                           
    FROM INVESTMENTS                            139,547         7,427          0       51,941         198,915 
                                                                                                       
  NET (DEPRECIATION) APPRECIATION IN                                                                   
    THE FAIR VALUE OF INVESTMENTS            (2,183,514)      127,206          0       26,568      (2,029,740)
                                                                                                       
  CONTRIBUTIONS: PARTICIPANTS                   613,976       145,575     40,637      122,116         922,304 
               : IONICS, INCORPORATED           306,987           0          0            0           306,987 
  FORFEITURES USED TO REDUCE                                                                           
    COMPANY'S CONTRIBUTIONS                         0             0          0            0               0 
                                                                                                       
  INTERFUND TRANSFERS                               0          19,418    (67,884)      48,466             0 
                                                                                                       
  WITHDRAWALS BY AND                                                                                   
    DISTRIBUTIONS TO PARTICIPANTS              (380,470)      (73,098)   (10,356)     (53,595)       (517,519)
  NET CHANGES IN PLAN                                                                                  
    EQUITY FOR THE YEAR                      (1,501,307)      258,608    (29,369)     221,050      (1,051,018)

  PLAN EQUITY- END OF YEAR                  $ 6,422,977    $1,024,029   $247,868     $694,988     $ 8,389,862


THE ACCOMPANYING NOTES ARE AN INTEGRAL PART OF THESE FINANCIAL STATEMENTS.


















                                                 

                                                         -5- 
</TABLE>
<PAGE>
<TABLE>

                              IONICS, INCORPORATED SECTION 401(k) STOCK SAVINGS PLAN
                                  STATEMENTS OF INCOME AND CHANGES IN PLAN EQUITY
                                                   (CONTINUED)
<CAPTION>


                                            IONICS,INC.    EQUITY         CASH 
                                              COMMON       INCOME       RESERVES     PURITAN
                                            STOCK FUND      FUND          FUND         FUND         TOTAL
  <S>                                       <C>            <C>          <C>          <C>            <C>
  YEAR ENDED DECEMBER 31, 1992
                                                                         
  PLAN EQUITY- BEGINNING OF YEAR            $4,813,598     $630,004     $ 240,720    $329,237     $6,013,559
  NET INVESTMENT INCOME, PRINCIPALLY                                                                   
    INTEREST AND DIVIDENDS                       1,004       27,087         9,505      22,837         60,433 
                                                                                                       
  REALIZED NET CAPITAL GAINS                                                                           
    FROM INVESTMENTS                                 0        2,284             0      20,584         22,868 
                                                                                                       
  NET APPRECIATION IN THE FAIR                                                                         
    VALUE OF INVESTMENTS                     2,547,745       66,281             0      13,654      2,627,680 
                                                                                                       
  CONTRIBUTIONS: PARTICIPANTS                  468,968      108,449        43,996      80,079        701,492 
               : IONICS, INCORPORATED          234,491            0             0           0        234,491 
  FORFEITURES USED TO REDUCE                                                                           
    COMPANY'S CONTRIBUTIONS                          0            0             0           0              0 
                                                                                                       
  INTERFUND TRANSFERS                                0      (20,889)       (3,599)     24,488              0 
                                                                                                       
  WITHDRAWALS BY AND                                                                                   
    DISTRIBUTIONS TO PARTICIPANTS             (141,522)     (47,795)      (13,385)    (16,941)      (219,643)
  NET CHANGES IN PLAN                                                                                  
    EQUITY FOR THE YEAR                      3,110,686      135,417        36,517     144,701      3,427,321

  PLAN EQUITY- END OF YEAR                  $7,924,284     $765,421      $277,237    $473,938     $9,440,880


  THE ACCOMPANYING NOTES ARE AN INTEGRAL PART OF THESE FINANCIAL STATEMENTS                           















                                                                                                 

                                                         -6- 
</TABLE>
<PAGE>
<TABLE>
 
                                                                                                       
                              IONICS, INCORPORATED SECTION 401(k) STOCK SAVINGS PLAN
                                STATEMENTS OF INCOME AND CHANGES IN PLAN EQUITY                        
                                                  (CONTINUED)                                          
<CAPTION>                                                                                                       
                                                                                                       
                                            IONICS, INC.   EQUITY         CASH                            
                                              COMMON       INCOME       RESERVES     PURITAN              
                                            STOCK FUND      FUND          FUND        FUND          TOTAL
  <S>                                       <C>            <C>          <C>          <C>            <C>                  
  YEAR ENDED DECEMBER 31, 1991
                                                                         
  PLAN EQUITY- BEGINNING OF YEAR            $2,936,753     $490,681     $139,953     $236,260     $3,803,647
  NET INVESTMENT INCOME, PRINCIPALLY                                                                   
    INTEREST AND DIVIDENDS                       1,834       27,404       11,932       15,994         57,164 
                                                                                                       
  REALIZED NET CAPITAL GAINS                                                                           
    (LOSSES) FORM INVESTMENTS                   81,728       (5,343)           0          (30)        76,355 
                                                                                                       
  NET APPRECIATION IN THE FAIR                                                                         
    VALUE OF INVESTMENTS                     1,604,764      121,083            0       42,560      1,768,407 
                                                                                                       
  CONTRIBUTIONS: PARTICIPANTS                  415,115      101,996       54,645       65,138        636,894 
               : IONICS, INCORPORATED          208,057            0            0            0        208,057 
  FORFEITURES USED TO REDUCE                                                                           
    COMPANY'S CONTRIBUTIONS                     (4,750)           0            0            0         (4,750)
                                                                                                       
  INTERFUND TRANSFERS                            1,248      (46,115)      46,983       (2,116)             0 
                                                                                                       
  WITHDRAWALS BY AND                                                                                   
    DISTRIBUTIONS TO PARTICIPANTS             (431,151)     (59,702)     (12,793)     (28,569)      (532,215)
  NET CHANGES IN PLAN                                                                                  
    EQUITY FOR THE YEAR                      1,876,845      139,323      100,767       92,977      2,209,912

  PLAN EQUITY- END OF YEAR                  $4,813,598     $630,004     $240,720     $329,237     $6,013,559

                                                                                                       
  THE ACCOMPANYING NOTES ARE AN INTEGRAL PART OF THESE FINANCIAL STATEMENTS                            
                                                                                                       
                                                                                                       
                                                                                                       
                                                                                                       
                                                                                                       
                                                                                                       
                                                                                                       
                                                                                                       
                                                                                                       
                                                                                                       
                                                                                                       
                                                                                                       
                                                                                                       
                                                                                                       
                                                                                                       
                                                                                                       
                                                                                                  


                                                         -7- 
</TABLE>
<PAGE>





              IONICS SECTION 401(k) STOCK SAVINGS PLAN


                    Notes to Financial Statements


Note 1:  Investment Programs

    Contributions made by employees to the Ionics Section 401(k) Stock
Savings Plan (the "Plan") may be used to purchase either common stock
of the Company or may be directed to be invested in any of three (3)
Fidelity Funds.  Matching Company contributions under the Plan are
invested solely in common stock of the Company.

    A brief description of each investment fund follows:

    a.   Ionics, Incorporated Common Stock Fund - This fund invests
         directed contributions solely in common stock of the Company.
         There were 438 active participants in this fund at December
         31, 1993.

    b.   Fidelity Equity Income Fund - This mutual fund maintains a
         broadly-based diversified investment portfolio of stocks,
         bonds and convertible securities with its primary objective
         of producing current income and capital appreciation.  There
         were 168 active participants in this fund at December 31,
         1993.

    c.   Fidelity Cash Reserves - This mutual fund is essentially a
         money market fund which invests principally in prime
         commercial paper, high-grade corporate obligations, U.S.
         Government obligations and Certificates of Deposit issued by
         major banks.  There were 82 active participants in this fund
         at December 31, 1993.

    d.   Fidelity Puritan Fund - This mutual fund maintains a broadly
         based, conservatively managed, diversified investment
         portfolio which is primarily income-oriented with a secondary
         emphasis on growth.  Its portfolio consists principally of
         high yielding common and preferred stocks and corporate
         bonds.  There were 147 active participants in this fund at
         December 31, 1993.

Note 2:  Investments

    Investment of the Plan in Ionics, Incorporated common stock is
stated at market, market being the last sale price on December 31, 1993
of Ionics, Incorporated common stock as reported on the New York Stock
Exchange.  Investments in the Plan of the three (3) Fidelity Funds are
stated at Net Asset Value of the funds reported as of December 31,
1993.




                                                         -8- 

<PAGE>



    Unrealized appreciation included in market value of investments at
December 31, is as follows:


                                                            Increase
                                1993           1992        (Decrease) 

    Ionics, Inc.             $3,146,842     $5,330,356     $(2,183,514)
    Common Stock Fund

    Equity Income Fund          197,076         69,870         127,206

    Puritan Fund                 59,444         32,876          26,568   

                             $3,403,362     $5,433,102     $(2,029,740)


Realized capital gains for 1993 are as follows:

                             Aggregate       Aggregate     
                                Cost         Proceeds          Gain   

    Ionics, Inc.             $1,085,931     $1,225,478     $   139,547
    Common Stock Fund

    Equity Income Fund          169,484        176,911           7,427

    Cash Reserves               178,202        178,202            -0-

    Puritan Fund                145,663        197,604          51,941

                             $1,579,280     $1,778,195     $   198,915


    The cost basis used to derive gain or loss on the sale of investments
is determined on the first-in, first-out method.


Note 3:  Taxes

    The United States Treasury Department issued a letter on April 15,
1987 indicating that the Plan met the requirements of Section 401(a) and
Section 401(k), and accordingly the Plan is considered to be exempt from
federal income taxes under provisions of Section 501(a).

    Elective contributions made to a plan under a qualified cash-or-
deferred arrangement are not includible in the employee's gross income.
Income taxes are postponed until the employee receives a distribution from
the plan.  In addition, earnings on elective contributions are accumulated
tax-free until distributed.


                                                         -9- 

<PAGE>





Note 4:  Subsequent Events

    Effective May 1, 1994, the Plan was amended to comply with regulation
404(c) by providing multiple investment selections for plan participants
and the opportunity to change investment elections on a quarterly basis.
The cash reserve and equity-income investment options were eliminated and
replaced by a guaranteed investment contract (GIC), asset allocation and
growth fund options.  Also, the Plan was amended to include loan
provisions for the participants based on certain rules including a minimum
amount of $1,000 and a maximum not to exceed the lesser of 50% of the
participant's total vested account balance or $50,000.




                                                         -10- 

<PAGE>

                               SIGNATURES



    Ionics Section 401(k) Stock Savings Plan.  Pursuant to the
requirements of the Securities Exchange Act of 1934, the trustees (or
other persons who administer the employee benefit plan) have duly caused
this annual report to be signed on its behalf by the undersigned hereunto
duly authorized.


                             IONICS SECTION 401(k)
                             STOCK SAVINGS PLAN



Date:  May 27, 1994          By /s/Marianne Manzon Winsser       
                                Marianne Manzon Winsser
                                Administrator
























                                                         -11- 


<PAGE>


                                                           EXHIBIT 1





                  CONSENT OF INDEPENDENT ACCOUNTANTS

    We consent to the incorporation by reference in the registration
statement of the Ionics Section 401(k) Stock Savings Plan on Form S-8
(Registration No. 33-2092) of our report dated May 18, 1994 on our
audits of the financial statements of the Ionics Section 401(k) Stock
Savings Plan as of December 31, 1993 and 1992, and for each of the
three years in the period ended December 31, 1993, which report is
included in this Annual Report on Form 11-K of the Plan which is being
filed as Exhibit 28 to the Annual Report on Form 10-K of Ionics,
Incorporated for the year ended December 31, 1993.




                                            Coopers & Lybrand

Boston, Massachusetts
May 27, 1994




























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