Hello Graham,

Your supplier is right. What you want when you use DI water is an ion
reduced water source. A good quality distilled water fits the bill.

Be careful though... DI water has a pH very slightly lower then distilled.

Depending on how often you need to refill, a bigger DI unit might be worth
the price in the long run.

Alain Savard, B.Sc.
Chemical Process Analyst
CAE Electronics Ltd.
e-mail: [log in to unmask]


-----Original Message-----
From: Collins, Graham [mailto:[log in to unmask]]

Good day Technetters!

A water / chemistry question for the TechNet today.  Is distilled water an
acceptable substitute for DI water?  My non-chemistry mind thinks so but I'd
like a more qualified opinion.

Why?  We are looking to up our cleaning capacity, and while the DI set-up we
have would keep up with the running requirements of a bigger cleaner, it
would have a hard time filling the tank for start-up.  So I can either buy a
bigger DI set-up, or buy DI water as required.  Our local filtering supplier
claims distilled will do, but I question his expertise.  Is he correct?

Graham Collins

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