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December 1999

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From:
"Parr, Aric" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 14 Dec 1999 13:28:23 EST
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What purity do you require?

For most applications, Distilled water is pure enough. Beyond a certain
purity, you must follow distillation with either deionization or reverse
osmosis. Your supplier can provide you with purity levels (measured as
resistivity or conductivity) of distilled water. Most cleaners have a
conductivity bridge indicating the resistivity of the incoming water (your
current purity level). You can make your own decision based upon these numbers.

A less expensive solution is to purchase a plastic storage tank with a sealed
lid and fill it when the cleaner is not running. Use this water for start-up.

Aric Parr
Sr. Process Engineer
Eaton Corporation
1400 S. Livernois
PO Box 5020
Rochester Hills, MI 48308-5020
248 608 7780
[log in to unmask]
---------- Original Text ----------

From: C=US/A=INTERNET/DDA=ID/TechNet(a)IPC.ORG, on 12/14/99 9:14 AM:

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?

As always - thanks, and have a Cool Yule!

Graham Collins
Process Engineer,
Litton Systems Canada, Atlantic Facility
(902) 873-2000 ext 6215

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