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Thread: Help with Plaster Stains

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    Help with Plaster Stains

    Love TFP! First time posting. This is second pool season using BBB method, third season with this older pool. I have brown staining all over the bottom of the pool. They were there when we took off the pool cover in early May. Seemed to get worse when we did the first shock of the season, but maybe we could just see them better.
    Pool water is sparkly and clear. Use Clorox for disinfecting. Added polyquat 60 before closing last fall, otherwise no other type of algaecide for a year. Two seasons ago used the Leslie's stuff for black and mustard algae in August and at closing. We had some plaster stains two seasons ago when we bought the house, but nothing like this. I've attached pics.

    FC 5.5
    CC 0
    pH 7.8
    TA 70
    CH 270
    CYA 40

    Constantly adding MA to keep pH below 8.0. And just had a spell when I had to keep adding calcium, as the CH suddenly dropped below 250.

    Any help appreciated! Thanks!
    Attached Images Attached Images
    @32,000 Plaster IG, 1.5 HP, TR100 Pentair Sand Filter, 74 GPM
    Baracuda MX8 cleaner, Mesh winter pool cover
    Richmond, VA

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    Mod Squad Bama Rambler's Avatar
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    Re: Help with Plaster Stains

    Have you tried to determine what type stains they are?
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Help with Plaster Stains

    Sock with crushed vitamin c tablets left a black stain! Will pick up trichlor pucks today and see if they do anything. Otherwise, really no clue how to determine what type of staining it is.
    @32,000 Plaster IG, 1.5 HP, TR100 Pentair Sand Filter, 74 GPM
    Baracuda MX8 cleaner, Mesh winter pool cover
    Richmond, VA

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    Mod Squad Bama Rambler's Avatar
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    Re: Help with Plaster Stains

    If the vitamin C turned it black it could ba copper. Let us know what the trichlor puck does to it and we'll go from there.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Help with Plaster Stains

    Ok. Thanks
    @32,000 Plaster IG, 1.5 HP, TR100 Pentair Sand Filter, 74 GPM
    Baracuda MX8 cleaner, Mesh winter pool cover
    Richmond, VA

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    Re: Help with Plaster Stains

    Hey Bama,
    After a couple hours with a trichlor puck, no difference. But the black stain caused by the vitamin c sock has now disappeared, and the same area is now noticeably more white. Now what? Does that mean all the stains are from the copper algaecide we used more than two years ago? I dread an AA treatment because the pool's pH is always high, and the process seems very complicated.
    @32,000 Plaster IG, 1.5 HP, TR100 Pentair Sand Filter, 74 GPM
    Baracuda MX8 cleaner, Mesh winter pool cover
    Richmond, VA

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    Mod Squad Bama Rambler's Avatar
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    Re: Help with Plaster Stains

    You may want to get a stain id kit and see what it says. My guess is metals of some sort and copper is the most likely. Some tablets have copper in them also so it could be more then the algaecide.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Help with Plaster Stains

    What stain ID kit do you all recommend?
    @32,000 Plaster IG, 1.5 HP, TR100 Pentair Sand Filter, 74 GPM
    Baracuda MX8 cleaner, Mesh winter pool cover
    Richmond, VA

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    Mod Squad Bama Rambler's Avatar
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    Re: Help with Plaster Stains

    Jacks makes the best one even though it's kind of expensive.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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