Steve:
If you're still looking for a water quality report on Tulsa, or any other
major (is that Tulsa?) city, try contacting Battle Labs...

-----Original Message-----
From: Stephen R. Gregory [mailto:[log in to unmask]]
Sent: Monday, October 18, 1999 4:58 PM
To: [log in to unmask]
Subject: Re: [TN] Deionized water...


In a message dated 10/18/99 3:02:44 PM Central Daylight Time, Hint pwb1
writes:
Hi Phil!

Read my comments below...

> Steve
>
>  The carbon filter is necessary in most water purification systems if the
> input water has greater than 1 ppm of chlorine.  Without the carbon filter
> the life of the bed is materially shortened.  Depending on several
factors,
> it could shorten the bed life by about 50%.  In the western US where we
see
> 300 to 1000 ppm TDS we normally use a RO ahead of the DI bottles and here
it
> is mandatory to use a carbon filter in front of the RO membrane if your
water
> chlorine concentration is greater than about 0.8 ppm of chlorine.  It is
> especially critical if some of the organic-chlorine substitutes that are
> popular with some water companies are used.  Chlorine can run as high as 4
> ppm in some supplies.

Yeah I hear ya', I used to be in Sunnyvale, California before I came out
here
to Tulsa, Oklahoma...and I can say there's a BIG difference in the water
quality between Tulsa and Sunnyvale! I can actually drink the water outta
the
tap here! In California, the water was okay if you didn't mind chewing it a
little..hehehe. Like they say about the air quality in Los Angeles, "Don't
trust any air that you can't see..."

In Sunnyvale, the water was from two major sources (or a blend of each,
depending on demand and supply), it was either coming from Hetch Hetchy
reservoir (up near Lake Tahoe) or from the wells drilled in the Santa Clara
valley....yummy! That was the GOOD water! (NOT!) But just from a laymans
taste buds, the TDS and chlorine levels out in California were much higher
than they are out here...and I never had a carbon bed before my D.I. beds
out
there, and was never recommended that I have one...
>
>  All water is not furnished to the user in equal form  and if you are
using
> the DI water to replenish a plating bath, it is mandatory that you use a
> carbon filter, if your water is from a surface source (river or lake
water).
> Some of these materials that can be removed from water with a carbon
filter
> will really screw up a plating bath.  If you are using the water for
washing
> the flux from circuit board assemblies, most organics arriving in the
water
> do not interfere with the cleanliness.

That's all I'm doing pardner, washing boards and that's it...

>  Your water supplier can furnish you a complete listing of the materials
in
> your water, and looking at these you can make choices as to whether to use
> carbon or not for your operation.
>
>  Phil Hinton

I been trying to locate a water quality report for the city of
Tulsa...proving a little harder to get my mitts on out here than it was back
in California...might be able to get it tommorrow though...

Thanks for your input Phil!

-Steve Gregory-

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