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Thread: Plaster blisters after drain/refilll?

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    Join Date
    Jul 2011
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    Plaster blisters after drain/refilll?

    So Friday night, I drained about 75% of my pool due to high CYA levels. After it filled up (took about 17 hours to fill back up) I noticed a few blisters in the plaster which broke open when I touched them. I noticed it on my top step and a few additional ones on the bottom of the pool. Did this happen because I drained the pool? Are those spots problems other than cosmetic?

    Thanks!
    Pool newbie. 25k gallon in-ground plaster pool with DE filter. MX8 and PoolSkim

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    Butterfly's Avatar
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    Re: Plaster blisters after drain/refilll?

    Welcome to the forum

    Can you post a full set of test results of water before you drained the pool?

    How old is the pool? Was it ever painted?
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    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

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    Re: Plaster blisters after drain/refilll?

    I don't have all the numbers handy but they were all in good range except my CYA was at 160. Its now at 50. I have owned the house for two years and don't have any past info on the pool. The plaster looked fine before I drained the water over the weekend. I am running the full set of TF100 tests tonight but water looks great after the refill and I just ran the CYA test after the refill to make sure the drain worked.

    Thanks!
    Pool newbie. 25k gallon in-ground plaster pool with DE filter. MX8 and PoolSkim

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    JasonLion's Avatar
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    Re: Plaster blisters after drain/refilll?

    A photo of some blisters would be a big help.
    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

  5. Back To Top    #5

    Join Date
    Jul 2011
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    Re: Plaster blisters after drain/refilll?

    Ran my first test after refill (only added bleach)

    PH- 7.5
    FC- 16
    CC- 0.5
    TA- 120
    CH- 350
    CYA- 55

    Levels look ok?

    I will see if I can post some pics of the plaster blisters. Can't seem to post photos from my iPhone so I need to send them to my computer.

    Thanks everyone!!
    Pool newbie. 25k gallon in-ground plaster pool with DE filter. MX8 and PoolSkim

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