I posted my first readings the other day and am in the process of trying to get my levels right. But I was wondering if anybody might have suggestions on what these black stains are? My water hardness is out of control and know some is scaling but is the black stain mold? It is only above the waterline where water flows into pool from rocks. No mold in pool. Not sure if I should wait to even address it until I get my CYA and chlorine under control. Thanks
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