err wait.. maybe I had that backwards..
Try this info..
At best the product water from a RO
unit is 90% pure, that is why it is a good idea to run the output through a Deionization Unit (DI
). The activated carbon and micron filter in the DI
part needs to be replaced about every 1,000 gallons of product water or every 6 months. Most DI
units are a mixed bed deionization unit. What this means is that the bad stuff in the water is removed via ionization. DI
units use two resins one to remove negatively charged ions (anions) and another to remove positively charged ions (cations). If the cations and the anions are kept separate they can be recharged, the better ionization units use this method.
So I guess the DI
part catches the 10% that slips by the RO
I'm sure if you are removing the phosphates and not using tap water your fish will be happy.