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I have SWG pool. 25k gallon. Just tested levels FC-1.5 TA-120 PH-8 Calcium-200 CYA:30-50 Had a heavy rain a couple of days ago, so added some shock. PH a little high, so added some muriatic acid right after shock. A couple of minutes later I noticed a dark "stain" at the bottom of the pool. It...

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