here is a chart of whats in my water beside h2o. i kknow the copper and nitrate is bad but what else here should i be worried about? how many stages of RO/DI should i get?
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It dampens the metals not removes them. If you are debating reasons to get an ro/di system vs to use tap water I would recommend to get the ro/di system but if you don't want to spend that most LFS have ro/di water for sale. I don't know it this is your case but you defiantly want to get the fluoride and chlorine out of your tap water before you use it in your tank.yeah ive used it with my freshwater aquariums when they have begun to stink. would yhis work as an
ro/di?

