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Thread: Blue spots in white plaster

  1. Back To Top    #1

    Join Date
    Dec 2013
    Location
    Orange County, CA
    Posts
    30

    Blue spots in white plaster

    I have been noticing some blue (baby blue) spots in my white plaster. Can't brush them out. I don't know if it's my copper plumbing (the return/suction valves at the filter are copper, but a lot of the piping has been replaced with PVC, especially throughout the pool, return jets, etc.). Plaster is about 2 months old. I know the plaster company has used HASA stain out after the water was filled and recommends a bottle every 6 months.


    Also, I have two brown spots that i cannot rub out with a stain eraser. Any recommendations on what to do next?
    Pool Specs: 26K, IG, Plaster, Hayward 1HP Superpump, Hayward ProGrid DE 6020

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    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: Blue spots in white plaster

    Get some Vitamin C tablets and set them on the spot for a while. See if they lift. If they do, it's metal. Even a broken-off nail head that took a fly into the pool can leave a rust spot in as little as two days. Ask me how I know.

    The blue spots? I haven't a clue. Can you post a picture?
    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!

  3. Back To Top    #3

    Join Date
    Dec 2013
    Location
    Orange County, CA
    Posts
    30

    Re: Blue spots in white plaster



    Pool Specs: 26K, IG, Plaster, Hayward 1HP Superpump, Hayward ProGrid DE 6020

  4. Back To Top    #4

    Join Date
    Jul 2011
    Location
    Arizona & California
    Posts
    771

    Re: Blue spots in white plaster

    Any update on the spots? If the treatment suggested above didn't work, you could try wet&dry sandpaper and see if they can be removed.

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