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Thread: Fiberglass hottub black algea or mold treatment?

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    Join Date
    Apr 2017
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    Fiberglass hottub black algea or mold treatment?

    Indoor small fiberglass hottub. Lots of black spots on tub surface. Drained tub, scrubbed with bleach. Filled tub, added bleach, circulated for an hour and drained again. Cleaned filter with hose. I still see vague bits of leftover black spots. Pool guy told me to let tub dry for a couple days. Now what do I do to keep it dead? Bleach more before refilling, or refill and treat with extra chemicals?
    Last edited by fmiller112; 04-24-2017 at 10:20 PM. Reason: Typo

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    Re: Fiberglass hottub black algea or mold treatment?

    If it's fiberglass the spots could be Cobalt,Cobalt Spotting - Solve My Pool Problems

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