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Thread: Mustard Algae, Green Algae Identification

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    Ronald U.'s Avatar
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    May 2015
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    Pearland, Texas (near Houston)
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    Mustard Algae, Green Algae Identification

    Would it be possible for Pool School to get more specific on differentiating MA from GA? Multiple photos of each, more distinguishing features. Thanks.
    In-ground gunnite, 24k gal., Hayward DE filter, bleach, borate, Hayward Tiger Shark robotic cleaner, 75% full sun

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    kcindc's Avatar
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    Sep 2011
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    Fairfax, VA
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    Re: Mustard Algae, Green Algae Identification

    Mustard algae hangs near the bottom of the pool and when brushed will kind of poof away in all directions. Green algae is usually suspended all over the water and attaches to surfaces, too.

    If you suspect you have mustard algae, you must first treat like it is regular old green alage first.

    A) First perform a regular SLAM: Pool School - SLAM - Shock Level And Maintain
    B) Second pass the 3 criteria for the SLAM (after passing the OCLT, having CCs less then 0.5 and clear water)
    C) Third raise the FC to mustard levels for 24 hours: Pool School - Chlorine / CYA Chart
    Karen
    33K IG w spa plaster, Pentair 1HP Whisperflo, DE Filter, SWG CircuPool RJ-60, Dolphin Triton Plus, Raypak Dig 336K BTU, TF-100.
    Pool Math Chlorine / CYA Chart SLAM - Shock Level And Maintain
    2017 replaster/retile

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