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I agree with the above post - Tap water is not inherantly bad, but it is variable. From personal experience, I knew someone who strictly used tap on his reef (he seemed to be doing it to prove a point or be stubborn, I don't know), and I guess every few years the water company flushes out the pipes by elevating or adding some chemical - I guess he did not get the memo, and lost all of his inverts.
I have acces to NSW out here, and will not use it for the same reason - it is not that it is bad, but it is variable, and as we all know consistency is the key to a succesful reef tank.
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