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Thread: black stains

  1. Back To Top    #1

    Join Date
    Aug 2008
    central kansas

    black stains

    I have some black stains on the floor of my pool that look like a burn from a lighter ( dark spot with a tail). I have had them every year, seems like some years are worse than others. Any way to get rid of them?
    20k inground fiberglass
    sand filter
    k-2006 test kit

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: black stains

    That sounds like it is probably organic staining. Try placing a trichlor tablet on one of the stains for 5 to 10 minutes and see what that does. If it is an organic stain, trichlor will remove it or at least lighten it up.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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