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Thread: Plaster is coming off

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    Plaster is coming off

    Hello,

    New to pools. We moved into our new home with below ground pool approx 2 months ago. Size of pool is approx 12,000 gallons and has a small connected spa, both with concrete/plaster finish. Pool's is somewhat stained (former algae blooms?), but okay for now. Thought we would have to acid bath or re-plaster sometime next year. I found your website and I am following the BBB method now.

    My problem is that small pieces of the plaster are coming off and exposing the concrete(?) underneath. Pieces vary from the size of a quarter for most spots to one spot that is 3inches by 2 inches. The exposed area beneath is rough and if I rub it with my finger it feels like loose particles of aggregate come off. This has been happening over the past 2 months and seems to be getting worse. My fear is that I'm doing something wrong chemically? Maybe it was a bad plaster job? Here are my latest test results:
    Water quality looks very good/clear.

    FC - 8
    CC - 0
    TC - 8
    PH - 7.8 (using dry acid mixed with water in 5 gallon bucket instead of liquid MA)
    T/A - 70
    CH - 400+
    CYA - 50 (this had been as high as 120, but drained 1/3 of pool water and stopped using the chlorine tablets)
    Temp - 64

    Thanks!
    12,000 gal IG plaster pool with spa/ Hayward vertical grid DE 60 sq. ft. filter/ 2hp motor/ Hayward gas heater

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    Melt In The Sun's Avatar
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    Oct 2009
    Location
    Tucson, AZ
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    Re: Plaster is coming off

    Welcome to TFP!
    Some pictures would help, but it sounds like you have plaster at the end of it's life. Flaking and exposing the underlying gunite is normal, and means it needs to be replaced. Do you know how old the plaster finish is? There's nothing obviously wrong with your test results (pH is a little high and a definite number for CH would be good), and certainly nothing that would cause this. It's just ordinary aging.
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
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    Re: Plaster is coming off

    I would have to guess that the plaster finish is 11 years old (house remodeled in 1999), and I'll try an upload some pictures later in the week. CH is 400 by my test (this is the hardest test for me, the color shifts more to clear than to red after 40 drops. Leslie Pool Supply listed my pool water at 310 when I had the water tested)

    Thanks!
    12,000 gal IG plaster pool with spa/ Hayward vertical grid DE 60 sq. ft. filter/ 2hp motor/ Hayward gas heater

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Plaster is coming off

    It is definitely time for new plaster. Lasting 10 or 11 years is more or less normal for plain plaster.

    The exposed gunite will leak, but only very very slowly. Other than that, there is no immediate risks to having failing plaster other than it not looking so good.
    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

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    Re: Plaster is coming off

    I really appreciate you answering my question. I'll probably wait until the end of summer (So Calif) before new plaster and enjoy the pool for now.
    12,000 gal IG plaster pool with spa/ Hayward vertical grid DE 60 sq. ft. filter/ 2hp motor/ Hayward gas heater

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