Hey Steve,

I am currently deionizing city water (Lake Michigan water) using cation/anion columns.  

My predecessors here had purchased a twin column system for closed-loop.  It never worked right -- had to be regenerated every couple of hours -- so it was abandoned and just sitting idle for at least two years.  With the help of my industrial water treatment consultant, I re-bedded the resin and re-plumed it to make city water into deionized water.  Works like a charm.

I don't have a carbon bed before my columns; don't seem to need it.  (Maybe that's part of the reason why the closed-loop never worked right!)  My consultant never even suggested carbon filtration before the cation/anion columns. 

If you want, I can give you my guy's name and phone number.  He should be able to give you the straight story and help you in convincing the powers that be.

Good luck!

Mike
==================
Michael S. Owens
Manager, Safety & Environmental Compliance
Poly Circuits, Inc.
215 Park St.
Bensenville, Illinois 60106
630-860-3560 x157
[log in to unmask]

----- Original Message ----- 
From: Stephen R. Gregory <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, October 18, 1999 1:20 PM
Subject: [TN] Deionized water...


> Hi ya'll!
> 
> I gotta question, do any of you that deionize city water for your cleaners,
> have a carbon bed before your cation, anion. and/or mixed beds? Now I'm not
> talking about a closed-loop Ion exchange filtering system, just straight
> water deionization.
> 
> Well, I discovered that we do (for now anyway). I called the vendor that
> services us (I'm tempted to say who it is, and they're big. Because I think
> they've been ripping my employer off), and asked why there is a carbon bed in
> front of the other beds.
> 
> Because from my understanding and experience the only reason you need a
> carbon bed is to filter out and remove the heavy metals and organic
> contaminates before they got to your cation and anion beds if you're
> closed-loop. I could always tell when my carbon beds were getting full, (or
> they weren't getting back-washed daily) when I started foaming in my
> cleaners.
> 
> Anyways, the guy said that the carbon beds will somehow extend the life the
> ion exchange resins by filtering the chlorine contained in city water...which
> I tend to question. When I was out in California (which has some of the
> hardest, most chlorinated water in the country) never was there a Carbon bed
> used before the ion exchange columns for my D.I. water, and this was the same
> company that serviced me in California as well. Was he tap dancing, or was
> there some truth to his logic?
> 
> I think the real reason is because a 3.6 cu. ft canister of either Cation or
> Anion beads are $97.50 ea., while a 3.6 cu. ft. canister of Carbon is $200
> ea...and nobody here ever questioned it.
> 
> -Steve Gregory-
> 
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