Doesn't like Kool-Aid
Join Date: Feb 2003
Location: Hawthorne, New Jersey
RO and distilled water are almost the same. You will either need to add chemicals to the distilled water to make it "livable", or add it to your tap water in some proportion so as to make your tap water a little more conducive to your needs.
How large is your aquarium? I also thought RO water was expensive, about cents a gallon. For me that would be $14 per water change, once a week, thats $720 per year! If I bought the water per gallon. The RO filter cost was $200. I will have to replace membranes at $100, but in the long run, if you have no alternative, RO isn't too bad.
Distilled water I think around here goes for about the same price 80 cents per gallon jug. Figure out how much distilled or RO you would need per water change and then do the math!
Let us know what you decide to do!