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Thread: Brown spots on floor of shallow end following seam

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    Brown spots on floor of shallow end following seam

    What is the brown spot? looks like it is growing but all chemicals OK. I think we have some water under liner. Shallow is concrete bottom. Is it possible for mold to grow through the liner?
    Grod 36,000 gal Vinyl w/pentair DE filter w/1 1/2 HP pump 120GPM

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    Mod Squad pooldv's Avatar
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    Re: Brown spots on floor of shallow end following seam

    Can you brush it? Is it hard or soft? Fuzzy? Dark brown? Light brown? How about a pic?
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    Defgufman's Avatar
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    Re: Brown spots on floor of shallow end following seam

    Please put your pool specs on your signature. How does it react to brushing? If it plumes into a little cloud when swept and returns to the same spot It's probably algae. Also what are your water numbers
    FC
    CC
    CYA
    PH
    TA
    Inground 13,200 gal Vinyl, Pentair 3/4 hp pump, Pentair Sand Dollar filter, Polaris 280

    Pool School, Pool Math, CYA to FC ratio chart, Testing Kits

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    Re: Brown spots on floor of shallow end following seam

    Light brown and can not be brushed.
    Grod 36,000 gal Vinyl w/pentair DE filter w/1 1/2 HP pump 120GPM

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    Defgufman's Avatar
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    Re: Brown spots on floor of shallow end following seam

    Can you post a picture
    Inground 13,200 gal Vinyl, Pentair 3/4 hp pump, Pentair Sand Dollar filter, Polaris 280

    Pool School, Pool Math, CYA to FC ratio chart, Testing Kits

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    Re: Brown spots on floor of shallow end following seam

    Fc 5
    cc 0
    cya 150
    ph 7.4
    ta 1200701150954.jpg
    Grod 36,000 gal Vinyl w/pentair DE filter w/1 1/2 HP pump 120GPM

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    Re: Brown spots on floor of shallow end following seam

    I put a 3" puck on spots and they faded away.
    Grod 36,000 gal Vinyl w/pentair DE filter w/1 1/2 HP pump 120GPM

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    Mod Squad pooldv's Avatar
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    Re: Brown spots on floor of shallow end following seam

    Ok, time to SLAM - Shock Level And Maintain the pool and brush regularly. If you want to keep the FC level a little below shock level so you can keep swimming that is fine. I did and it is much easier and cooler for me to brush when in the pool.
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    Mod Squad pooldv's Avatar
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    Re: Brown spots on floor of shallow end following seam

    Oops, just noticed that CYA is 150. That is going to take a LOT of bleach. With 150 cya you should keep FC at 18 at all times and never let it drop below 11 to keep the pool sanitized and algae free. Shock level is 59 ppm. It will take 24 bottles of 8.25% bleach to take 36k gallons from 5ppm FC to 59ppm FC.

    The best bet would be about a 50% drain and refill.
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    Re: Brown spots on floor of shallow end following seam

    I did drain about 2 foot of water and dropped my CYA down to 110. Should I slam at this point?
    Grod 36,000 gal Vinyl w/pentair DE filter w/1 1/2 HP pump 120GPM

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