Well my brother( I could tell when he seen his first reef tank he was hooked) hes taking the plunge and getting into the hobby. He is wanting to get a Ro system but I cannot offer an opinion. I currently have a kinetico whole house system with no di filter, which I don't know if its affecting my tank or not. What does everyone have for a system and do you like it? do you have to run a auto shut off valve on them, or how do you fill jugs or whatever you hold water in? Mine has a three gallon bladder tank that I empty out of, didn't know if the "Fish Catalog" systems had them or not? I'm clueless!