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Thread: stains on a gunnite pool surface.

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    stains on a gunnite pool surface.

    I am helping a buddy of mine open his 8000 gallon pool. We are noticing some extensive staining on the bottom and walls of the pool. Please see the attached picture. The pool is suppose to have the blue look to it and not the reddish dirty look.
    Any thoughts or suggestions on removing.

    Salt 2900
    Ph 7.2
    Alk - 60
    Cal - not tested yet
    Cya - 40
    Fc - 20(just shocked again)

    Tia,
    PF
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    The Most Interesting Pool Man in The World
    I don't always have clients that want to maintain their pool,
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    Mod Squad jblizzle's Avatar
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    Re: stains on a gunnite pool surface.

    You need to identify whether the stain is organic or metal and then we can offer the path forward.

    Organic: A trichlor puck will lighten the stain in a few minutes
    Metallic: Crushed up Vitamin C will lighten the stain in a few minutes
    Jason, TFP Moderator
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    Re: stains on a gunnite pool surface.

    Thanks will do.
    The Most Interesting Pool Man in The World
    I don't always have clients that want to maintain their pool,
    but when I do, I send them to troublefreepool.com!

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    Re: stains on a gunnite pool surface.

    Have not run the stain test yet....but the pool is ripping through the free chlorine.
    Went through 20ppm in two days.

    Pool clarity is at 90% but I wonder if there is a chance the "stain" is active algae,
    Or if there are little pockets of algae hiding

    ...thoughts
    The Most Interesting Pool Man in The World
    I don't always have clients that want to maintain their pool,
    but when I do, I send them to troublefreepool.com!

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    Mod Squad jblizzle's Avatar
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    Re: stains on a gunnite pool surface.

    Are you brushing while you are in the shock process?
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: stains on a gunnite pool surface.

    No.
    Should I use any type or should i use an algae brush.
    We have brushed it a couple of times and doesn't move but we are using a plastic one.
    We should probably upgrade, yes??
    The Most Interesting Pool Man in The World
    I don't always have clients that want to maintain their pool,
    but when I do, I send them to troublefreepool.com!

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    Mod Squad jblizzle's Avatar
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    Re: stains on a gunnite pool surface.

    If the plaster is over a year old, you can use a stainless brush or a combo one.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
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    Re: stains on a gunnite pool surface.

    The pool has undergone the shocking and brushing process since last post.
    It is still burning through the Free Chlorine, I last shocked and brushed it this am.

    I did perform the stain test with the 3" puck, it sat on the pool bottom for 5+ minutes there was no reaction.
    I have not yet tried the Vitamin C test, but wouldn't the lack of a result from the first test have us lean towards it being a Metal Stain
    at this point?

    Thanks again for all the help.
    PF
    The Most Interesting Pool Man in The World
    I don't always have clients that want to maintain their pool,
    but when I do, I send them to troublefreepool.com!

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