Keep in mind that with a DI, the medium is more expensive
than the medium in RO, so while a DI does not waist water,
it does cost more for the medium, and water is not that
expensive. DI uses ion exchange.

Kent Marine sells a unit, and there are many other
manufactures.

The way that the RO works is that water is passed through
a RO membrane, while some water is allowed to exit without
passing through the membrane. This water that does not
pass through the membrane is your brine water.

Wayne Sallee
Wayne's Pets



Bryan wrote on 10/6/2006 3:11 PM:
My question was moreso about the waste. Is there water waste coming out of
the RO part or is it all made/separated in the DI. Any suggestion on that
DI that you said would not waste water?

"Wayne Sallee" wrote in message
ink.net...
With DI you have one medium that removes positive charged ions, and
another medium that removes negative charged ions. The medium is in the
form of beads.

Wayne Sallee
Wayne's Pets



Bryan wrote on 10/6/2006 12:48 PM:
Is the DI where most or all of the waste is separated?

B

"Wayne Sallee" wrote in message
ink.net...
http://www.poly-bio-marine.com/koldproduct.htm
http://www.poly-bio-marine.com/faqkoldthree.htm

The product literature seems slanted to me. I would not use it.

If you want a filter unit that does not waist water, then go with a
quality DI unit instead.

Obviously the kold-sterile is some form of DI, but it does not look too
great to me.

Wayne Sallee
Wayne's Pets



Bryan wrote on 10/4/2006 7:52 PM:
I know the reef community preaches RO/DI. I'm wondering if anyone on
this forum has had any personal experience with the Kold-sterile
filtration system. I just don't like having my water being wasted
making RO/DI.

I only find some old articles/forums about this product. Sounds like
they were *almost* popular about 5 - 6 years ago.

B