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Thread: Stain on bottom of pool

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    Join Date
    Apr 2017
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    San Antonio, TX
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    Stain on bottom of pool

    Hi all,

    New pool owner here and I'm having trouble with some stains on the bottom of my pool. I've scrubbed and scrubbed and it won't budge. I've got everything balanced now so wondering what I can do to get rid of them. Picture below.

    Prime Photos

    Any ideas on what it is and how to clean up?

    Thanks,

  2. Back To Top    #2
    Mod Squad pooldv's Avatar
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    Re: Stain on bottom of pool

    Welcome to TFP!

    Are there IMG codes in google? You can paste them into the forum and the pics will show up in the forum so people don't have to click out to find the forum to see the pics.

    More here about pool stains, Pool School - Pool Stains
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  3. Back To Top    #3

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    Re: Stain on bottom of pool

    Not sure if this link is better.
    Stain Photo

    mod note: Added IMG tags below


  4. Back To Top    #4

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    Re: Stain on bottom of pool



    - - - Updated - - -

    Here is the stain. I tried some stain free stuff I bought and it seems to have faded a bit. Any ideas on how to get rid of it?

  5. Back To Top    #5
    Richard320's Avatar
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    San Dimas, CA (LA County)
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    Re: Stain on bottom of pool

    That's Calcium scale that has been tinted by metals and/or algae.

    It won't lift easily or quickly. It can be dissolved by keeping the CSI slightly negative and brushing with a steel brush, but think glacially in terms of speed.

    If you want it gone this year, you're looking at an acid wash or sandblasting.
    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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    duraleigh's Avatar
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    Re: Stain on bottom of pool

    +1 what 320 said.....both in terms of identification and solution.

    My thinking is you have lived with it for some time so trying the slow approach (months) to getting rid of it might be your best bet.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  7. Back To Top    #7

    Join Date
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    Re: Stain on bottom of pool

    Thanks for the help fellas. I was kinda thinking it was scale. My water looks great and is balanced so it should be safe to swim right. Just an eye sore for the time being?

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