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Thread: Brown circle stains and wall stains

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    Brown circle stains and wall stains

    We have a San Jaun pool and recently noticed that there are some new round stains on the floor and walls of the pool and advice would help. We don't use a well but with the 100' degree weather we have been adding alot of city water. We have a white fiberglass pool.

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Brown circle stains and wall stains

    Welcome to TFP!

    Fiberglass stains even at fairly low levels of metals in the water. Try placing a vitamin C tablet on one of the stains. If the stain lifts around where the vitamin C tablet was then they are metal stains. If the stain is unaffected it might be something else entirely.
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