It's semi-DIY.
My father owns a Culligan dealership ( Culligan is a national
residential and commercial water treatment company in the US ) and put
it together from parts he had laying around.
It was a TFC membrane for several years. Then when I asked him for a
replacement he grabbed me a CTA.
A few months after I got it I came across an article stating that
there were potential problems with non chlorinated water and CTA
membranes. I asked my father about it ('cause he's supposed to know
these things) and he said that there should be nothing to worry about.
Well water is full of bacteria and therefore would destroy the CTA
membrane. But city water is chlorinated and should be bacteria free.
The carbon prefilter removes the chlorine so the water reaching the
CTA membrane should be chlorine and bacteria free.

Any thoughts? Is my logic incorrect?


Erik


On Fri, 6 Aug 2004 08:38:17 -0500, "Pszemol"
wrote:

"erik" wrote in message ...
3 stages of carbon filtration sounds funny to me.
My Culligan RO unit has a 5 micron sediment/carbon stage followed by
an RO membrane.
Since it's a CTA membrane I'm only getting about a 95% rejection of
"bad stuff"

Hm... you have carbon filter in front of your CTA membrane... strange.
I understand CTA membrane is made from organics (cellulose) and
needs chlorine in the water to kill bacteria chewing on cellulose...
Your carbon filter is removing chlorine from the incoming water...
How long do you use your setup? Is it DIY or purchased complete?