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Thread: Questions and Help regarding Mustard Algae Slam

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    Questions and Help regarding Mustard Algae Slam

    Hello, been using the TFP method since April of this year after I fired the pool guy. These forums have been a wealth of information and everything has been going by the book until recently.

    In the end of June I noticed small yellow patches in the attached spa and a few in the shady areas of the pool. Fearing I had the dreaded mustard algae I did the mustard algae slam and everything went according to plan. Four days later by the beginning of July I could no longer see the yellow patches in the pool, but there were slight yellow streaks in the spa. These "streaks" would not brush off no matter how vigorously I worked at them, so I thought they were stains. My numbers were fine (4FC, 0CC, 7.8PH, 100TA, 70CYA) for 3 days so I thought I was fine. Set my SWCG at 60%-8 hours/day and went away for a 4 day vacation.

    Came back to 0FC and yellow patches all over the pool and spa!

    Started a Slam again on 7/12 - starting numbers: 0FC, 7.4PH, 100TA, 70cya. Turned on the filter for 24/7 and turned off the SWG, using the PoolCalc and a FAS/DPD tester I brought the FC level up to 39. First OCL was 18ppm.
    7/15 - I brought the FC level up to 45, OCL was 17ppm.
    7/16 - I brought the FC level up to 45, OCL was 8ppm.

    First question, am I supposed to keep the FC level at Mustard Shock levels or let them fall to regular SLAM levels (and then do OCLT)??? Since I am still having OCL, there must still be algae present, right? Any advice at what my next course of action should be?

    Some notes: Because of my job, I can only check the water/add chlorine at 6:00am (before I leave for work) and after 5:00pm (when I get home). Current Southern CA weather is mid 80s and no clouds - my pool is in the sun from 8:00am to 7:00pm. My water is super clear and has been throughout, but I have been brushing daily and vacuumed before slam.
    approximately 17000 gallon freeform in-ground gunite w/ attached 1k spa, Jandy Aquapure 1400 SWG, Jandy DEV60 pool/spa filter 2hp, Jandy LXI heater
    Orange County, California

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    Mod Squad pooldv's Avatar
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    Re: Questions and Help regarding Mustard Algae Slam

    The recommendation is to complete a regular SLAM and then do mustard level for 24 hours. More here, Pool School - Mustard Algae
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    Re: Questions and Help regarding Mustard Algae Slam

    So I should make sure I pass a OCLT at regular slam levels and then maintain Mustard Slam levels for 24 hours after passing a OCLT?

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    Mod Squad jblizzle's Avatar
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    Re: Questions and Help regarding Mustard Algae Slam

    That is correct
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Mod Squad pooldv's Avatar
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    Re: Questions and Help regarding Mustard Algae Slam

    And brush, a LOT.
    TFP Moderator
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    Re: Questions and Help regarding Mustard Algae Slam

    Quote Originally Posted by Trojanman View Post
    So I should make sure I pass a OCLT at regular slam levels and then maintain Mustard Slam levels for 24 hours after passing a OCLT?
    Quote Originally Posted by jblizzle View Post
    That is correct
    jblizzle,

    So by this logic, are you saying that it is possible to have Mustard Algae while actually passing the OCLT test? If that is the case I think I may possibly have Mustard Algae in my pool. My pool passes the OCLT and passes the 3 criteria for finishing a SLAM but I am still getting a lighting coating of dust/algae on the bottom and in the seams on the bottom of pool, nothing on the sides and no slimy feeling and the dirt poofs up into a cloud and goes away with a very light touch. Water is perfectly clear and all numbers are within range no cc's and normal daily fc loss, it just looks like dirt on the bottom almost every morning in the seams that won't filter out.

    Thanks,
    cruiser310

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    Re: Questions and Help regarding Mustard Algae Slam

    So on 7/20, my OCL was 1ppm, so I figured I was really close. Then this morning (7/21 - 0600hrs.) my OCL was 5ppm!!!!! 41ppm at 9:45pm. I did do something I don't normally do. I added my chlorine at 8:30pm, but then I brushed the pool. Normally I brush the pool around 5 or 6pm. Could brushing that late and an hour before my final FC test affect my OCL that much??

    Cruiser310,
    Yes, my first bout with the mustard algae I passed the OCLT but still had those slight yellow "stains". After the 4 day vacation the algae came right back.

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    Mod Squad jblizzle's Avatar
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    Re: Questions and Help regarding Mustard Algae Slam

    If there was something you disturbed by brushing, then that could certainly cause a higher FC consumption.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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