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Thread: How do I know if I have mustard algae?

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    Join Date
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    How do I know if I have mustard algae?

    The Pool Calculator offers a shock level for mustard algae. How do I know when I have to use that?
    13,500 Wilkes Vinyl AG (15'x30' rectangular)
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    JasonLion's Avatar
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    Re: How do I know if I have mustard algae?

    Mustard algae is usually a yellow/brown color and grows on the floor and the walls on the shady side of the pool. It tends to come back even after you shock the pool correctly.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: How do I know if I have mustard algae?

    Hmm... I haven't seen that color.
    13,500 Wilkes Vinyl AG (15'x30' rectangular)
    Hayward Power-Flo LX SP1580, 1HP
    Hayward S-160T High Rate Sand Filter

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    skydiva44's Avatar
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    Re: How do I know if I have mustard algae?

    Sorry to butt in...but if it tends to come back after shocking correctly, then HOW do you get rid of it?
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    JasonLion's Avatar
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    Re: How do I know if I have mustard algae?

    To get rid of mustard algae, you need to do a regular shock, then raise FC up to mustard algae shock for 48 hours and brush absolutely everywhere, under the steps of the ladder, behind light niches, etc. Also, all pool toys, pool tools, and bathing suits need to either be soaked in high FC water, wiped down with a dilute bleach solution, or washed in a clothes washer.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: How do I know if I have mustard algae?

    Wow, I really hope I don't have/get this.
    I don't think so. It seems to be done. The pool was close to crystal clear when I got home. 2 FC (It was 8 FC when I left in the AM.)
    But shocking at mustard shock level tonight (in addition to what I had been doing in my other thread) seemed to hold. I only had one measurement that dipped a few FC, but the rest of the tests were all good, no drops. I'll see how I am in the AM.

    Incidentally skydiva, I see you have two diva's living with you. (The Shih-Tzus in your pic.) We have one, and she is the Queen of the castle for sure.
    13,500 Wilkes Vinyl AG (15'x30' rectangular)
    Hayward Power-Flo LX SP1580, 1HP
    Hayward S-160T High Rate Sand Filter

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