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Thread: What is this?

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    What is this?

    Any direction on these spots - sort of looks like mold to me. (background: water was in rather good condition, detected a leak, let it drain down and let the chems go, fixed the leak, re-filled, now just getting everything back in order - or trying). I haven't done the overnight cl consumption test but seem cl has been being consumed rather quickly - understandable. I'm guessing I should just bring it to shock level.

    Also, are the rust stains cause for concern? I've heard it's due to re-bar...?

    Thanks for your input!
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    ~10,500gal IG Plaster; Hayward Sand Filter; Kreepy Krawly cleaner

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