Originally Posted by fishfreek
BUT, with that said RO
water is as close to pure H2O as you can get via filtration. The fact that at the top this unit says it makes great water for all types of fish it leads me to belive that many of the metals and minerals that are common to natural freshwater enviorents are not filtered out by this unit.
Like you said the Tap Water Purifier is a DI
unit. It'll remove pretty much everything, depending on the flow rate through the cartridge.
These things are fine if you have fairly good tap water to begin with. If you're running very hard water with a high TDS
level, the cartridge won't last very long. Of course, this is what Aquarium Pharmaceuticals is hoping for.
Adding RO/DI water to freshwater tanks with no additives to replace the vital minerals and such can be detramental to plant and fish health because the water will litrally pull the minerals out of the fish and plant cells.
Years ago I read this same thing about humans drinking RO
water. Turned out to be a load of crap. My RO
filter was intended to be a drinking water system. It even came with a faucet to mount on my kitchen sink.