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Thread: Spots on plaster... Help been through 2 pool guys no help

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    Spots on plaster... Help been through 2 pool guys no help

    Hi, our pool is just hitting the 1 yr. mark. All was fine and then we decided to hire a pool guy. The first one was late, spent all of 5 min here then left, etc. so we nixed him pretty quick.

    The 2nd one we kept for 3 months. At the beginning I told him about the light stains on the plaster and showed him. He said getting the chemicals right would fix it. He seemed to know what he was talking about so we hired him. At the end of the quarter he wanted to renew so I went to look at the pool and it was worse!

    I let him go but now I am trying to fix on my own. I have gotten the water tested and all things are in the good range. I put some phos free in because that's all it needed according to WPS testing. But stains are still coming. I tried putting lemon and scrubbing to no avail. Now I have a chlorine tab to see if that does anything (the pool guy told me to do this). So far the only thing happening w the tab is it is turning purple on the bottom of the tab itself. Nothing to the plaster.

    I am exhausted with trying to figure this out... Please HELP my plaster is staining and I see no way out.

    Thanks for any help at all.

    1yr old newbie on her own
    10,000gal fiberglass kidney
    3/4 hp whisperflo
    Sand dollar SD80
    IC40 SWCG
    (2) PAL2000 multi colored LED lights
    all 2" plumbing
    no water features/no spa
    TF Testkit

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    JasonLion's Avatar
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    Re: Spots on plaster... Help been through 2 pool guys no hel

    Could you post a full set of water test results? Also, what color are the spots? And are they rougher, the same, or smoother than the surrounding plaster?
    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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    Butterfly's Avatar
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    Re: Spots on plaster... Help been through 2 pool guys no hel

    Some pics of the spots would also be helpful.

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    Re: Spots on plaster... Help been through 2 pool guys no hel

    Ok they are brownish, rough and I will upload pic once I figure out how.

    Water results

    Free Chlorine 5.0
    Total Chlorine 5.0
    Combined Chlorine 0.0
    Ph 8.2
    Hardness 425
    Alkalinity 115
    Cyanuric Acid 100
    Copper not run
    Iron not run

    The guy told me to add 2 pt Muriatic Acid so I did.
    10,000gal fiberglass kidney
    3/4 hp whisperflo
    Sand dollar SD80
    IC40 SWCG
    (2) PAL2000 multi colored LED lights
    all 2" plumbing
    no water features/no spa
    TF Testkit

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    Re: Spots on plaster... Help been through 2 pool guys no hel

    Sorry just read ur what to post. The water is clear. The spots have progressively gotten worse over the last 5 months. Which is when the pool began having very small spots and the plaster looks kind of marbled very light greyish color.
    10,000gal fiberglass kidney
    3/4 hp whisperflo
    Sand dollar SD80
    IC40 SWCG
    (2) PAL2000 multi colored LED lights
    all 2" plumbing
    no water features/no spa
    TF Testkit

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    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    Re: Spots on plaster... Help been through 2 pool guys no hel

    Your description and your water test results both point towards calcium scaling. Calcium scaling occurs when some combination of PH, TA, and CH are too high. Your PH is way too high, while your TA and CH levels are both a little to high, and that combination is enough to push you into calcium scaling.

    I suggest that you start working on lowering TA, which will also bring the PH down. There are instructions on how to do this in Pool School.

    Removing calcium scale is work. The traditional approach is to drain the pool and do a manual acid wash. If there isn't to much you can also remove it by essentially grinding it off with a pumice stone.

    By the by, your CYA level is way too high. That wouldn't affect the staining one way or another, but it does tend to make it pool difficult to manage.
    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: Spots on plaster... Help been through 2 pool guys no hel

    WOW. Thank you so much. Hmmm.... I will read on how to lower the TA. I think we are going to drain the pool try the pumice stone if that does not work then I will do an acid wash while the water is out. It is so frustrating because one person says one thing and another a differing thing. I was told it is good to have the CYA high because this will keep the equipment running better (not as hard) and therefore last longer.

    One more question, what concentration of MA do I use, if the pumice stone does not work? Now to read on lowering TA

    Thank you again,
    Lisa
    10,000gal fiberglass kidney
    3/4 hp whisperflo
    Sand dollar SD80
    IC40 SWCG
    (2) PAL2000 multi colored LED lights
    all 2" plumbing
    no water features/no spa
    TF Testkit

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

    Re: Spots on plaster... Help been through 2 pool guys no hel

    When doing an acid wash there is a balance between speed and complexity/skill required. Higher concentrations of muriatic acid go more quickly, but require more skill to keep under control. I suggest you start with one part acid to five parts of water. If that seems easy to hand try 1 to 4, and so on.
    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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