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Thread: Black areas around fiberglass pool fittings

  1. Back To Top    #1

    Join Date
    May 2010
    Location
    Kelseyville, Ca
    Posts
    17

    Black areas around fiberglass pool fittings

    A friend has a 11yr old fiberglass pool that is developing black areas around some of the fittings. He says that the black areas feel like silicon and can be peeled off, but then reappears. I have done some searching and it seems to me it may be "cobalting", but I would like some more opinions.
    Thanks,
    Harry
    15635 gal Silver Lake AG doughboy with 52" walls, 7' deep end, 48" normal level.
    1 1/2 hp Hayward pump, Hayward C-1500 150sq ft cartridge filter, 120gpm
    Hayward Navigator cleaner
    Shaded til mid morning, direct sun for approx 7-8hrs

  2. Back To Top    #2

    Join Date
    May 2007
    Location
    South Central NJ
    Posts
    3,192

    Re: Black areas around fiberglass pool fittings

    If it's tar like, it is in fact cobalting. Notify the manufacturer.

    Scott
    Owner of - PoolGuyNJ LLC
    Expert Pool and Spa Repairs, Renovations, and Augmentation. Helping people decide what is the right gear for meeting their needs. Expectations Set, Expectations Met, No Surprises.

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