Quote Originally Posted by discuspro
What about phosphates and heavy metals? I would be scared to use anything other that RO-DI unless you know exactly what is in your water. Get that RO-DI system, actually what kind of tank do you have? I mean SPS, LPS fish-only, etc?
Phospates = 0, Nitrates 0 We checked for metals and found none. I was really surprised. However my water comes from the ground water about 500 feet from the lake. I was concerned until we tested it and it came out ok. I'm going to go ahead and setup a RO-DI system at the other house.

BTW what's the difference between Ro and RO-DI. Is the deionization really that important?