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Thread: Mustard frustration

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    Mustard frustration

    Include me in the ranks of those battling mustard algae, in the shallow.shady end of pool. A couple of years ago I posted about re plaster issues I had with my contractor. Marbling and pitting shortly after the job, it's in this area of the pool I am now fighting mustard for the second seasno. Have shocked at 24, brushed daily and within days the algae was back. FC levels one week after shock still high at 9.

    pH 7.5
    TA 90
    CH 350+ (high since botched plaster job)
    CYA 40
    Borate 50

    Is the faulty plaster an issue? Not ready to add copper....have a great success with TFP!
    Thanks.

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    duraleigh's Avatar
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    Re: Mustard frustration

    read "How to Shock Your Pool" up in Pool School....it doesn't sound like you are following that process.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    JasonLion's Avatar
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    Re: Mustard frustration

    Pitting does create small areas with bad circulation, which can harbor algae and are difficult to brush properly.

    Have you seen the article on fighting mustard algae in Pool School?
    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: Mustard frustration

    OK...going back to re read the shock and mustard treatment methods. Will report back. Thanks.

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    Richard320's Avatar
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    Re: Mustard frustration

    You know what to do.

    If it was me.... when I added the bleach to take it up to MA shock level, I'd try to pour it in that area, and then quickly scrub that wall with a wall whale brush.


    That flap converts the backwards-forwards motion you provide to some serious downward pressure that should get into some of those pits a little better.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Mustard frustration

    Thanks Richard...appreciate your encouragement. Re checked the CYA higher than I thought at 60. So the FC is now at 34, brushed and filter running overnight and through tomorrow. Will keep FC at 34 for 24 hrs. Lights removed and brushed also.

  7. Back To Top    #7

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    Re: Mustard frustration

    Cleared! After a Memorial Weekend battle the mustard algae is gone. Thanks for getting back on right track (shock/TA).
    Question: at what FC levels on the way down from 34ppm does my Ph test become effective?

  8. Back To Top    #8
    Butterfly's Avatar
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    Re: Mustard frustration

    Quote Originally Posted by caljw
    Cleared! After a Memorial Weekend battle the mustard algae is gone. Thanks for getting back on right track (shock/TA).
    Question: at what FC levels on the way down from 34ppm does my Ph test become effective?
    10

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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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  9. Back To Top    #9

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    Re: Mustard frustration

    Thanks. Will try and get some after pics...don't have any before but the steps are clean and white, hope it lasts

  10. Back To Top    #10
    Richard320's Avatar
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    Re: Mustard frustration

    Party at JW's house!

    Maintain FC and you may never have to go through the shock process again.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  11. Back To Top    #11

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    Re: Mustard frustration..it's back!

    Dang. After a few day the mustard started to reappear. FC levels were maintained at shocks levels(34) per pool calculator for 48 hours. FC has not dropped below 6 ppm since. Running out of R-0871 and patience....

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