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Subject:	Re: Water
From:	Ted Stern <[log in to unmask]>
Reply To:	[log in to unmask]
Date:	Tue, 20 Apr 1999 12:44:18 -0700
Content-Type:	text/plain
Parts/Attachments:	text/plain (42 lines)

Dear Franco:

You should be able to obtain a "maximum" and "typical" analysis of your
incoming "city" water (assuming it is not well water) from your
municipal water plant. The analysis should include hardness (as calcium
carbonate), TDS (total dissolved solids), TS (total solids), TSS (total
suspended solids), Cl, F, Fe, Pb, As, Hg, pH, NO3/NO2, and total
coliforms. Typically, the parameters which yeild measurable results
include hardness, TS, Cl, F, and perhpas iron. It would be worthwhile
to ask for data on copper as well.

Regarding an incoming spec on water in terms of compatibility with your
chemical processes, I would recommend contacting your individual
suppliers. It is common for pcb manufacturers to treat incoming water;
utilizing soft and/or DI water for particular processes based upon
vendor recommendations. For example, Fe contamination can be
detrimental to many sensitizing chemistries. Additionally, water
hardness may be a factor in critical rinsing applications such as post
oxide rinsing. Due to the variability in specifications of municipal
water supplies, you may or may not be able to employ untreated water for
some of these critical applications. And in some processes utilizing
municipal water, you may find the process can be improved by using DI
water.

If you have more questions, feel free to call me.

Regards,
Ted Stern
612-479-6525

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