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Thread: Mustard Algae, Green Algae Identification

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    Ronald U.'s Avatar
    Join Date
    May 2015
    Pearland, Texas (near Houston)

    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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    TFP Guide

    kcindc's Avatar
    Join Date
    Sep 2011
    Fairfax, VA

    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
    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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