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If you're buying RO/DI water fm your LFS. Maybe it's time for him to check his TDS of the water he's selling. Ask him when he last checked it. I can't imagine him selling less than pure water. If he is, then it's time to find a new 1
I will ask today cause I gotta go today but just to say I have 2 salt water reef tanks my 65g which is the one with the problem and a 29g Bio cube which is in perfect condition both get the same water for top offs and pwc's