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    Yellow staining on the wall - metal? mustard algae? calcium buildup?

    Gotcha - will order the test kit and the copper & scale stuff. TY Draining the pool water is not an option for now so I will have to do this:
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    Yellow staining on the wall - metal? mustard algae? calcium buildup?

    Yea sorry for the typo - Hardness and Alkalinity are high for me each at 800+ and 200. I read online and here mostly that citric acid was used to remove copper stain but I have also tried ascorbic acid. Thanks for responding btw. I have been dealing with all of this for a little over 2 months...
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    Yellow staining on the wall - metal? mustard algae? calcium buildup?

    Thanks for the response y'all !! 💙 Copper stain: I tried removing it with citric acid which apparently removes copper stain and event at direct contact it did nothing. Yes, I have used algicide and clarifiers with copper content in it. I have added metal gone to decrease metal content together...
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    What up

    Ash from sunny California :)
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    Yellow staining on the wall - metal? mustard algae? calcium buildup?

    Hi all, I have a relatively new pool owner. Have had it for about 2 years. I do my own chemistry and up until last year (2023) my pool was perfectly fine. This last winter the pool got a bit more dirtier than usual and upon opening this summer I have had a many issues and have spent more money...