Originally Posted by lossam8199
I'm having some trouble getting a straight story or any reliable information from the internet about whether or not to use RO
water for topping off my freshwater tank. I understand that tap water is better suited for initial set up and water changes so I am specifically referring to topping off due to evaporation. It would seem to make sense that using use tap water for evaporated top off would eventually increase the concentration of "stuff" contained in the tap water and that RO
would keep those concentrations consistent. However, this doesn't seem to be normal practice. Any thoughts on this from the experts out there?
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Makes sense to me, I'd go for it.
On the other hand as the concentration of minerals build up, you end up taking more out with each water change so the tank would stabilize at a slightly higher GH
than the tap water. I feel like using RO
water would be a great choice, but if you have glass tops and a tank that isn't very large I don't think getting RO
water just for top ups is really worth it.