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Thread: mustard algae

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    Join Date
    Jun 2010
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    Dayton, Ohio
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    mustard algae

    I think I have mustard algae. Yellow bottom, brushes off, water looks green. I have kept my pool at shock level for two days. It is no longer grass green but a dull color with yellowish bottom. I keep reading mustard algae requires a different shock level is that true or is 15 good enough. I know bleach is a cheaper alternative but starting to get pricey.
    AGP: 24' x 52" cartridge filter: 13,500 gallons. Taylor K-2006 test kit.

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    Mod Squad woodyp's Avatar
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    Apr 2010
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    East Texas
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    Re: mustard algae

    Sure it's not just pollen??? Does it stir up really easy, disappear off the bottom, and remain in suspension? Gonna need a full set of test numbers to help diagnose for you.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
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    Re: mustard algae

    TC 15
    FC 15
    pH 7.5
    TA 110
    Calcium Hardness 225
    Stabalizer 40

    and the pool bottom feels grainy
    AGP: 24' x 52" cartridge filter: 13,500 gallons. Taylor K-2006 test kit.

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    duraleigh's Avatar
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    Apr 2007
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    Sebring, Florida
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    Re: mustard algae

    bring the FC up to around 20, brush the yellow spots as often as you can, run pump 24/7 and I'll bet you have a clear pool very soon.

    Importantly, keep your FC up higher than you have been for the rest of the season. There is no sanitizer cheaper than bleach, I believe. Sure, you can split fine hairs and maybe find a deal but bleach is the best overall.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Jun 2010
    Location
    Dayton, Ohio
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    Re: mustard algae

    its driving me crazy!
    AGP: 24' x 52" cartridge filter: 13,500 gallons. Taylor K-2006 test kit.

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    frustratedpoolmom's Avatar
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    May 2007
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    SWSuburban Chicago, IL
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    Re: mustard algae

    Have you done an overnight FC loss test?
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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