January 1st, 2013, 09:52 PM
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#2
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Premium Member
Join Date: Jan 2012
Location: BKLYN
Posts: 192
Rep Power: 25 
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I've had that when I was in an apartment. Came from the hardness of the water. Pipes that are old will also contribute...Have you tested carbonate hardness? Since in this house I haven't had it anymore
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