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Thread: Mustard Algae?

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    Join Date
    Aug 2010
    Location
    Central Fl
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    Mustard Algae?

    I've just recently found this website and converted to the BBB method. My pool looks the best it ever has BTW. My question is, there are several spots that are tinged in yellow, mostly around the steps and the shallow end. I'm trying to decide if it's mustard algae or just stains from algae outbreaks I've had in the past. Latest test numbers:

    FC - 7.5
    CC - 0
    PH - 7.6
    TA - 12
    CH - 340
    CYA - 60

    Can I have mustard algae and still have a CC level of 0? As soon as I got the TF test kit I shocked the pool to normal levels and the water is crystal clear, but I'm wondering if I need to shock up to MA levels.

    Can't tell you how much I appreciate this site!

    Wayne
    18,000 Gal IG Plaster
    100 SF Hayward Cartridge
    3/4 HP Hayward
    Pool is screened and shaded with a big-*#! oak tree

  2. Back To Top    #2

    Join Date
    Feb 2008
    Location
    Denton, TX
    Posts
    5,061

    Re: Mustard Algae?

    Is it on the walls of the pool as well as the floor? Can you brush it away? Does it have a tendency to return again after being brushed away? Does it feel slimy? Have you been losing FC overnight? Any of these things can indicate MA.

    If you suspect that you have MA, you should shock at MA levels. You should also clean all pool toys well with a bleach solution since MA likes to hang around on things like that.

    For the record, you can have MA and still have no CC.

  3. Back To Top    #3

    Join Date
    Aug 2010
    Location
    Central Fl
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    Re: Mustard Algae?

    Thanks for the quick reply 257. You basically confirmed what I had pretty much already decided, which was MA level shock. Yes it is on the walls, brushes away but stubbornly, and it comes back. I've only done one OCLT and didn't lose any but if I can have MA and still have 0 CC's I guess that is reasonable.

    At any rate, it won't hurt to err on the side of caution.
    18,000 Gal IG Plaster
    100 SF Hayward Cartridge
    3/4 HP Hayward
    Pool is screened and shaded with a big-*#! oak tree

  4. Back To Top    #4
    JasonLion's Avatar
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    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Mustard Algae?

    It sounds like you are on the right track.

    I just noticed that your TA level reads 12. I hope that is a typo and it is actually 120 (or something else reasonable). If TA is actually 12 you want to raise it right away.
    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

  5. Back To Top    #5

    Join Date
    Aug 2010
    Location
    Central Fl
    Posts
    8

    Re: Mustard Algae?

    You're right Jason, it was a typo. 120, left off the zero. Happy Fingers!
    18,000 Gal IG Plaster
    100 SF Hayward Cartridge
    3/4 HP Hayward
    Pool is screened and shaded with a big-*#! oak tree

  6. Back To Top    #6

    Join Date
    Aug 2010
    Location
    Central Fl
    Posts
    8

    Re: Mustard Algae?

    OK, so I just brought the pool up to MA shock level. The water is clear, do I still need to run the pump continuously for the duration of the shock process?
    18,000 Gal IG Plaster
    100 SF Hayward Cartridge
    3/4 HP Hayward
    Pool is screened and shaded with a big-*#! oak tree

  7. Back To Top    #7
    frustratedpoolmom's Avatar
    Join Date
    May 2007
    Location
    SWSuburban Chicago, IL
    Posts
    11,965

    Re: Mustard Algae?

    yes
    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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