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Thread: Oh No! Mustard Algae?

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    Oh No! Mustard Algae?

    My pool water is nice and clear - just gorgeous. However, yesterday I realized what I though were stains on the side of the pool are probably algae - I could rub some of it off with my thumb. It's not green (and the green algae cleared right up when I initially shocked the pool), so I'm afraid it might be mustard algae. Though my pool gets a lot of sun, it is found on the side that is shaded most of the day, and in some "rough" areas of the concrete. Here are some pics:







    My numbers are:

    FC - 4
    pH - 7.8
    TA - 100
    CH - 320
    CYA - 45

    Thanks,

    Kelley
    Kelleyaynn
    21,000 gallon (+ or -) in-ground plaster pool with Nautilus DE filter, 1 hp pump, and Zodiac G4 automatic vacuum.

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    linen's Avatar
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    Jul 2010
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    Twin Cities, MN
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    Re: Oh No! Mustard Algae?

    That does sound/look like it could be MA. Have you read this pool school article?: http://www.troublefreepool.com/pool-.../mustard_algae

    The first step is the normal shocking process.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: Oh No! Mustard Algae?

    Thanks, that's what I figured I'd have to do. Just wanted some verification that it probably was mustard algae.

    Then, when that's done, I think I'll add borates.

    Kelley
    Kelleyaynn
    21,000 gallon (+ or -) in-ground plaster pool with Nautilus DE filter, 1 hp pump, and Zodiac G4 automatic vacuum.

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