i'm setting up my first reef tank and i'm thinking of using NSW as its cheaper. would it be best to buy a RO unit for top ups or just buy RO water from a LFS. (is RO water cheap to buy?)
how big is the aquarium, what kind of lighting are you using. I have found in the past that ro/di from the pet store or the water stores sometimes have very high tds because they don't change their filters as often as they should.
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