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  1. G

    Mustard algae

    I treated mustard algae with yellow out per direction... Is this still yellow out, or could it be dead algae? This is the most gray blob matter we've ever had in the bottom of the pool / spa and this is 2.5 days after start of treatment. Please help. Thank you.
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    20201030_101246.jpg

  3. 20201030_095854.jpg

    20201030_095854.jpg