January 25, 2005


Mail Stop 03-06

Via Facsimile (617-926-4304) and U.S. Mail

Stephen Korn, Esq.
Vice President and General Counsel
Ionics, Incorporated
65 Grove Street
Watertown, Massachusetts 02472-2882

	Re:	Ionics, Incorporated
		Amendment No. 1 to Preliminary Schedule 14A
		submitted January 24, 2005
		File No. 001-07211

Dear Mr. Korn:

      We have reviewed your response to our January 21, 2005
letter
and have the following comments.  Where indicated, we think you
should revise your document in response to these comments.  If you
disagree, we will consider your explanation as to why our comment
is
inapplicable or a revision is unnecessary.  Please be as detailed
as
necessary in your explanation.  In some of our comments, we may
ask
you to provide us with supplemental information so we may better
understand your disclosure.  After reviewing this information, we
may
or may not raise additional comments.

	Please understand that the purpose of our review process is
to
assist you in your compliance with the applicable disclosure
requirements and to enhance the overall disclosure in your filing.
We look forward to working with you in these respects.  We welcome
any questions you may have about our comments or on any other
aspect
of our review.  Feel free to call us at the telephone numbers
listed
at the end of this letter.

Opinions of Ionics` Financial Advisors - Page 21
1. We have considered your response to comment 5 and your
subsequent
telephone calls.  If you believe that the dollar amount of
compensation need not be disclosed in the proxy statement, please
include narrative disclosure that provides investors a clear
understanding of the magnitude of the amount paid to the financial
advisors by the target for the fairness opinions in this
transaction
relative to the amounts paid by the acquirer over the past two
years.
Investors should be given an opportunity to consider this
information, along with other factors they may consider material,
in
making their voting decisions.  Also disclose what consideration
the
Ionics board gave to the acquirer`s relationships with the
financial
advisors.
2. Please expand your disclosure in response to comment 3 to
clarify
how using two firms would assist the company in obtaining the
highest
value for its shareholders.  You disclose that the terms of the
merger agreement, including the consideration to be paid, were the
result of negotiations principally between Messrs. Brown and
Woodburn.  It appears that the consideration had already been
negotiated between the parties, and that each financial advisor
was
engaged merely to render an opinion as to the fairness of the
consideration already negotiated between the two parties.
3. Please make your disclosure regarding the relationships with
the
financial advisors more clear.  Separate into distinct paragraphs
the
disclosure regarding the fees paid by Ionics to the financial
advisors.  Similarly, revise to discuss the work each financial
advisor has performed for GE in separate paragraphs.  Avoid
embedded
lists; instead use bullets or numbered lists.

Form 8-K filed December 13, 2004
4. We note that on November 23, 2004--one day before the parties
agreed to the merger, Ionics approved cash bonus payments to 11
management employees, including its named executive officers, in
the
amount of $870,000 which are in addition to contractually required
cash bonues.  We note that it also established target bonuses for
Messrs. Brown, Curtis, and Dickerson on that date.  Expand to
discuss
this information in the proxy statement if these actions were
related
to this transaction in any way.  If they were not related to the
GE
acquisition, advise supplementally in a written response.
5. Please also explain why your Form 8-K was not timely filed.

      As appropriate, please amend your filing and respond to
these
comments.  You may wish to provide us with marked copies of the
amendment to expedite our review.  Please furnish a cover letter
with
your amendment that keys your responses to our comments and
provides
any requested supplemental information.  Detailed cover letters
greatly facilitate our review.  Please submit your response and
your
January 24 letter by EDGAR.  Also, please understand that we may
have
additional comments after reviewing your amendment and responses
to
our comments.

      	Please contact Eduardo Aleman at (202) 824-5661, or me
at
(202) 824-5697 with any questions.

							Sincerely,



							Russell Mancuso
							Branch Chief


cc (via facsimile):  Mark Burnett
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Stephen Korn, Esq.
January 25, 2005
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