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Thread: Mustard Algae with Crystal Clear Pool?

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    apoteker's Avatar
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    Mustard Algae with Crystal Clear Pool?

    Is it possible to get mustard algae and have your pool look crystal clear and pool chemistry stable? I have a 31,500 gallon pool and my chemistry readings are consistently as follows:

    pH 7.6
    FC 4.5
    CC 0
    TA 80
    CYA 55
    CH 60

    Every night I test and add 12% liquid chlorine to get my FC up to 6 which I have as my target FC. My problem is that I have noticed that I have mustard algae forming in the pool which is very confusing to me. It looks like I will have to SLAM my pool this weekend to get rid of it but I don't understand how I even got it in the first place since I have been faithful in testing and adjusting. Any help would be appreciated.

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    JasonLion's Avatar
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    Re: Mustard Algae with Crystal Clear Pool?

    Welcome to TPF!

    It is possible to have mustard algae even when the water is fairly clear and FC levels are normal. However, it is also quite easy to mix up pollen accumulating on the bottom with mustard algae. Is any of the "algae" appearing on the walls of the pool on the shady side? Or does it only appear on the bottom of the pool? Real algae almost always grows on the walls on the shady side, pollen only accumulates on the bottom.

    There is a good article in the Solving Problems section of Pool School with much more detail on Mustard Algae.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    apoteker's Avatar
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    Re: Mustard Algae with Crystal Clear Pool?

    Yes, unfortunately it is starting to appear on the wall as well

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    Re: Mustard Algae with Crystal Clear Pool?

    apoteker - I have encountered the exact same problem here in Southwestern Michigan. My pool numbers are good, and consistently so, being maintained right at my targets:

    pH 7.6
    FC 5
    TA 90
    CYA 35

    Still, the yellowish algae (started early this week on the shady south wall of my vinyl pool) is flourishing (was on all surfaces as of last evening - looked very much like pollen, but I'm pretty sure it's algae). Water otherwise looks good. Time to read that Mustard Algae article in the Pool School, I guess. Good luck with yours.
    Lee
    22500 gal., 18'x36' IG vinyl (built 1991)
    sand filter, 1 HP Hayward Super Pump
    Near Kalamazoo, Michigan

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    apoteker's Avatar
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    Re: Mustard Algae with Crystal Clear Pool?

    Sounds like it's not that uncommon to have a situation like mine (or ours Verndoggy). I guess the next question would be whether to use a polyquat algaecide after I get rid of the mustard algae. Any thoughts?

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    apoteker's Avatar
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    Re: Mustard Algae with Crystal Clear Pool?

    So the mustard algae article in pool school says to SLAM normally and then bump up to mustard algae levels for 24 hours. So I would shock at normal levels (about 20 something ppm FC level) and then bump up to mustard algae levels (about 30 something ppm FC levels for 24 hours? Would just performing a SLAM at mustard algae levels be sufficient?

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    Butterfly's Avatar
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    Re: Mustard Algae with Crystal Clear Pool?

    Quote Originally Posted by apoteker View Post
    So the mustard algae article in pool school says to SLAM normally and then bump up to mustard algae levels for 24 hours. So I would shock at normal levels (about 20 something ppm FC level) and then bump up to mustard algae levels (about 30 something ppm FC levels for 24 hours? Would just performing a SLAM at mustard algae levels be sufficient?
    Complete the normal SLAM process first. You will be done when you pass the three required criteria. See red lines in my sig.

    THEN, do the MA shock process. Follow that process to a T.
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    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

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    Re: Mustard Algae with Crystal Clear Pool?

    Quote Originally Posted by Butterfly View Post
    Complete the normal SLAM process first. You will be done when you pass the three required criteria. See red lines in my sig.

    THEN, do the MA shock process. Follow that process to a T.
    Just completed the normal SLAM process and the mustard algae (or is it pollen, I really don't know) is still evident when I brush the bottom today (yellow/green clouds), but not on sides of pool. I passed all three of the criteria in your signature, Butterfly. You are saying to STILL move ahead to the MA shock process, right?
    Last edited by Verndoggy; 06-30-2014 at 03:00 PM. Reason: clarity
    Lee
    22500 gal., 18'x36' IG vinyl (built 1991)
    sand filter, 1 HP Hayward Super Pump
    Near Kalamazoo, Michigan

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