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Thread: Help with a nasty plaster stain...

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    Help with a nasty plaster stain...



    I can't get rid of this stain by shocking the pool. Any suggestions on what to do?
    ~23,500 Gallon In-Ground Plaster Pool, Intelliflo VS+ Pump, Hayward 4820 DE Filter, IntelliChlor IC40 SWG

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    Mod Squad YippeeSkippy's Avatar
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    Re: Help with a nasty plaster stain...

    Two tests: Hold a chlorine puck against the stain and see if it disappears. And grab some cheap Vitamin C tablets and try them on the stain.
    If the puck works-its organic. If the Vit C works its a metal stain.
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    Re: Help with a nasty plaster stain...

    I've got one of those too. Can't brush it off, elevated chlorine didn't do much, but it's only been a day. If it doesn't improve in a few days or so I might lay a puck on it for 15 minutes and see what that does. If that doesn't work I'm planning on diving to it when it warms up and scrubbing.
    32K gallon Plaster - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL
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    Re: Help with a nasty plaster stain...

    Quote Originally Posted by Mr Bruce View Post
    I've got one of those too. Can't brush it off, elevated chlorine didn't do much, but it's only been a day. If it doesn't improve in a few days or so I might lay a puck on it for 15 minutes and see what that does. If that doesn't work I'm planning on diving to it when it warms up and scrubbing.
    What are you going to scrub it with?
    ~23,500 Gallon In-Ground Plaster Pool, Intelliflo VS+ Pump, Hayward 4820 DE Filter, IntelliChlor IC40 SWG

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    Re: Help with a nasty plaster stain...

    Quote Originally Posted by Drockfresh View Post
    What are you going to scrub it with?
    The same brush head that goes on the pole. I'm actually bored and decided to go ahead and try the puck. It looks exactly like yours and is raised, like caked mud or something.

    edit: Puck got it 80%. I'm going to let time and whatever chlorine is in the pool finish, I was uncomfortable leaving it on the floor any longer.
    32K gallon Plaster - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL
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    Mod Squad pooldv's Avatar
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    Re: Help with a nasty plaster stain...

    If a puck helps then you can raise your FC up to SLAM level for your CYA and brush it a few times a day or more and it should go away in a week or two. Chlorine CYA Chart
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    Re: Help with a nasty plaster stain...

    Drockfresh (OP), let us know what you find!

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    Re: Help with a nasty plaster stain...

    It doesn't look like "black" algae, so I think the black stain is most likely from the rebar "rusting" below the plaster surface (gunite) and then bleeding to the surface. To fix requires chipping out the plaster and gunite down to the rebar and removing and treating properly so that it doesn't rust again. Chlorine tabs, acid, and other treatments won't stop this type of problem because it is all the way through the plaster coat.

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    Re: Help with a nasty plaster stain...

    Quote Originally Posted by onBalance View Post
    It doesn't look like "black" algae, so I think the black stain is most likely from the rebar "rusting" below the plaster surface (gunite) and then bleeding to the surface. To fix requires chipping out the plaster and gunite down to the rebar and removing and treating properly so that it doesn't rust again. Chlorine tabs, acid, and other treatments won't stop this type of problem because it is all the way through the plaster coat.
    I bet that's what it is because the pool has had other structural issues. I just rebuilt the bond beam after it crumbled into the pool. Then I had to knock out and replace the deck. spent too much on that project- you wouldn't believe it.

    If there is ever money to replaster I'll take care of this. For now will have to let it be. There is no way I'm draining the pool to deal with this.
    ~23,500 Gallon In-Ground Plaster Pool, Intelliflo VS+ Pump, Hayward 4820 DE Filter, IntelliChlor IC40 SWG

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