Kathy,

Brian has given you the most complete answer.  If you can live with up
to 10 micro S of conductivity, I would consider using RO.  It will be
preceded with carbon which will remove most of the organics and
the RO most of the ionic contamination.  Then, if you need purer
water, you can put mixed beds at the end of the RO for very high
quality.  The mixed bed resins can be rented or bought.  The RO
will greatly extend the life of the mixed beds.  The best combination
depends on the quality and quantity of water needed.  If you need or
use RO elsewhere, you can put small mixed beds at point of use.

Gary McCauley

-----Original Message-----
From: Kathy Kuhlow [mailto:[log in to unmask]]
Sent: Friday, March 30, 2001 2:41 PM
To: [log in to unmask]
Subject: [TN] Water Wash system justification


Help.....  I have recently been assigned the task of justifing our water
wash system.
Here is what I know:

1) Spray over Spray Westkleen system
2) For some reason using softened water not DI.  The softening is
accomplished through sodium addidtives (got me going).

What I am expected to do:  Determine what is the effectiveness of the
process.  Justify why DI isn't used and why adding salt to the wash to
remove salt is ok.  Then determine the water surface tension and content
(hardness, contaminates present, etc)

TIA
KK

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