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Thread: Brown spots on pool bottom

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    Brown spots on pool bottom

    I've recently noticed patches of brown spots on my pool bottom in the deep end. Neither brushing nor vacuuming remove the spots. My current readings are:

    FC: 10.5
    CC: 0
    pH: 7.2
    TA: 210
    CH: 380
    CYA: 90

    Does anybody have any idea what the spots might be and how I can get rid of them?
    25K Gal, IG gunite, Hayward 1HP pump, Hayward DE filter, Pentair Mastertemp 250, TF100 test kit

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    reebok's Avatar
    Join Date
    Apr 2009
    Lakeland, FL

    Re: Brown spots on pool bottom

    you can try putting a vitamin c tablet on them.
    16x32 21,000 gallon in-ground exposed aggregate, 1.5hp pump, 120 sqft catridge filter, birdcage, solar panels, aquavac tigershark qc robot.

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    In the Industry
    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Brown spots on pool bottom

    Yeah, iron would be my guess but it's only a guess. Holding the vitamin C tab on the stain for a minute or two should confirm it if it's iron. If the Vitamin C has no effect, high FC levels will most likely cause it to fade away in time. Can you post a good pic?
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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