Question:
I am about to get a water purification system for my house which uses a KDF-55 pre-filter. Anyone out here have any experience with this? I've searched old forums, but no joy. I don't want to ask the company rep about it; they'd just probably shoot me a line anyway...

Answer: Did you ask what is inside KDF-55 "prefilter"? And how is the main filter working? Such systems are usualy water softener systems... Just to remove large rust particles and calcium hardness.

For reef tanks we usualy use multi-stage filters with main stage being reverse-osmosis (RO) and the last stage using ion-exchange resins (called de-ionisator, DI) further polishing water coming out from the RO filter. As a result we receive pure water, cleaner than distilled water you can get in the grocery stores.

Rather than whole-house purification system we use such RO/DI filters just for drinking water and to fill up tanks for mixing saltwater.

Piece of reallay. Check out filtersdirect.com and get a decent rodi unit and not get ed inthe process. Its hard to beat a unit with clear housings..........solid color housing leave al ot to be desired............ Filters Direct has them for $122.00 delivered with your choice of membrane capacity from 35 to 100 gpd and all american made as well., Its comonly called Water General........do an Ebay search, then call and ask for Oscar...............and BTW the filter direct Water General is made by Honeywell Systems.Aquatechnics division...far from being a piece of junk!