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Thread: Copper Sulfate Staining a concern for blue gray mottled plaster pool?

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    Copper Sulfate Staining a concern for blue gray mottled plaster pool?

    Been following TFP for tips for years, you folks are great. First post. I have a lingering green algae problem that is not going away despite a super shock & scrub (above 24 FC, I know probably not good for some plastic pool parts). Also been doing the phos free for weeks.
    So people don't like Copper sulfate because it stains, but should I care with a blue gray plaster with blue gray 3M that is not uniform color?
    I don't know what is worse for people's health, Copper sulfate, or this Polyquat 60 with a chemical name I can't pronounce. I've used it before but just makes me worried.
    Plus it seems with Copper sulfate I can reduce chlorine levels, which is health benefit. Any other downsides to Cu? My house plumbing is Cu, seems couldn't be that bad, but then again, if it kills algae, what else can it do?

    Thanks for any tips
    Paul Rousseau
    12.5K Gunite pool with blue gray plaster and 3M
    Pentair 1.5HP pump and Polaris 360

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    Mod Squad jblizzle's Avatar
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    Re: Copper Sulfate Staining a concern for blue gray mottled plaster pool?

    Welcome to TFP!!!

    Sounds like you are spending all kinds of money on products that we would not recommend using in the first place.

    Forget the copper, forget the phosphates.
    You need to follow the ShockLevelAndMAINTAIN Process until you pass the 3 criteria to stop.

    What is your CYA? That is what determines your required FC level according to the FC/CYA Chart. If you CYA is high, then the FC of 24ppm might not have been high enough. Also, realize it is the ratio that is important. 24ppm of FC will not damage anything if your CYA is high too.
    Jason, TFP Moderator
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    Mod Squad pooldv's Avatar
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    Re: Copper Sulfate Staining a concern for blue gray mottled plaster pool?

    Welcome to TFP!

    I pick none of the above. Go for the SLAM - Shock Level And Maintain
    TFP Moderator
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    Re: Copper Sulfate Staining a concern for blue gray mottled plaster pool?

    thanks for advice. My CYA was around 30 (a little low for salt cell) so I shocked with bags to raise is a bit. I scrubbed pool 3 times and chlorine was very high for 3-4 days, but I didn't do the 3 criteria test.
    Paul Rousseau
    12.5K Gunite pool with blue gray plaster and 3M
    Pentair 1.5HP pump and Polaris 360

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    Mod Squad jblizzle's Avatar
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    Re: Copper Sulfate Staining a concern for blue gray mottled plaster pool?

    Well, without proper testing and following the SLAM process, you are flying blind.
    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
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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