FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * DICKERSON LYMAN B   2. Issuer Name and Ticker or Trading Symbol IONICS INC [ION] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) VICE PRESIDENT (Last) (First) (Middle) ECOLOCHEM INC, 2855 NW 75TH AVENUE 3. Date of Earliest Transaction (Month/Day/Year) 02/22/2005 (Street) MIAMI, FL 33122 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 02/22/2005   U   1,946,926 D (1) $ 44 0 I By The Lyman B. Dickerson Qualified Grantor Retained Annuity Trust #1 (2) Common Stock 02/22/2005   U   216,324 D (1) $ 44 0 I By The Lyman B. Dickerson Revocable Trust dated September 9, 1996 (3) Common Stock 02/22/2005   U   130,111 D (1) $ 44 0 I By The Lyman Dickerson Irrevocable Trust FBO Preston G. Dickerson (4) Common Stock 02/22/2005   U   130,111 D (1) $ 44 0 I By The Lyman Dickerson Irrevocable Trust FBO Lily J. Dickerson (4) Common Stock 02/22/2005   U   28,958 D (1) $ 44 0 I By The Lyman Dickerson Irrevocable Trust FBO dated July 1, 1991 (4)

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
DICKERSON LYMAN B ECOLOCHEM INC 2855 NW 75TH AVENUE MIAMI, FL 33122	X		VICE PRESIDENT

Signatures

/s/ Stephen Korn, Attorney-in-fact		02/22/2005
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	The disposition of the securities is exempt pursuant to Section 16b-3(e).
(2)	The Reporting Person serves as the sole trustee for the Lyman B. Dickerson Qualified Grantor Retained Annuity Trust #1, and has the sole power to direct the voting and disposition of its shares.
(3)	The Reporting Person serves as the sole trustee for the Lyman B. Dickerson Revocable Trust, dated September 9, 1996, and has the sole power to direct the voting and disposition of its shares.
(4)	The Reporting Person has no voting power and shared dispositive power over the shares held by The Lyman Dickerson Irrevocable Trust FBO Preston G. Dickerson, The Lyman Dickerson Irrevocable Trust FBO Lily J. Dickerson and the Lyman Dickerson Irrevocable Trust dated July 1, 1991. The independent trustee of the Lyman Dickerson Irrevocable Trusts, Charles C. Kline, has sole voting power and shared dispositive power as to all shares held by The Lyman Dickerson Irrevocable Trust FBO Preston G. Dickerson, The Lyman Dickerson Irrevocable Trust FBO Lily J. Dickerson and The Lyman Dickerson Irrevocable Trust dated July 1, 1991.

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