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Thread: Brown spots that form into bulbs that empty to form a crater

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    Brown spots that form into bulbs that empty to form a crater

    Help. This is my dads pool. He tests every week more than I do and this is staring. Chlorine pool with brown spots that form into bulbs that empty to form a crater. Is this bad chemicals or bad work job?
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    Charlie_R's Avatar
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    May 2013
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    Mexico, MO
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    Re: Brown spots that form into bulbs that empty to form a cr

    Just out of curiosity, what is the pool's pH?

    For that matter, do you or your dad have a good test kit?

    If possible, could you post a full set of test results?
    15'x48" 4500 gallon Intex pool, buried 1.5 ft. Pac-Fab Dynamo 3/4 hp pump. Hayward S180T sand filter, bought used. Taylor K-2006 test kit. Rocket mass heater based wood fired pool heater.

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    Richard320's Avatar
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    Re: Brown spots that form into bulbs that empty to form a cr

    Just out of curiosity.....is that pool painted?
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Jul 2011
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    Re: Brown spots that form into bulbs that empty to form a cr

    If the brown spots are raised up off the surface and are very rough or sharp, then it maybe that they are calcium nodules that form on cracks and delamination spots in the plaster.
    If that is what they are, then that is not "bad chemicals" but rather bad bonding on the plaster job.

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