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What causes black stains that look like dirtto form overnight on a diamond brite inground pool surface finish?
Wiki User
∙ 16y ago
The stains could possibly be from copper. Your pH may be or has been below 7.0. Check your pH and Total Alkalinity and adjust. k
Wiki User
∙ 16y ago
Wiki User
∙ 13y agocause you haven't cleaned your pool in a long time
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