We used carbon filtering for a few reason: Chlorine, bacteria, algea,
potential
pesticides or other organic residues, and who knows when the city might
decides
to change a pipe and not bother to tell anyone (of course, the city can
always be
thrusted).
Alain Savard, B.Sc.
Chemical Process Analyst
CAE Electronics Ltd.
e-mail: [log in to unmask]
-----Original Message-----
From: Stephen R. Gregory [mailto:[log in to unmask]]
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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