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Thread: Can this be mustard algae?

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    Join Date
    Jun 2014
    Location
    Morristown, NJ
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    6

    Can this be mustard algae?

    Seeing what appears to be a yellowish buildup on the side walls of my pool. Not sure what it can be...hoping it is not mustard algae. I had something similar a few days before I closed my pool last September but I vacuumed it up and closed the pool. Opened the pool early May and have had no hint of this at all until the past week. I vacuumed it the first time I saw it and shocked the pool and then a few days later it came back and I vacuum it again and it slowly accumulates again. It is showing up generally in the same area of the pool. I have high CYA that I didn't want to fix yet since we have been using the pool frequently so I have been keeping my FC high and it has been steady so that's my only hope as far as this not being algae. Anyone have any ideas? Can it just be pollen? Is that even a possibility in August in the New Jersey area?

    FC - 8.0
    TC - 8.0
    Alkalinity- 85
    PH - 7.6
    CYA - 80

    pool2.jpg
    25k gallon vinyl liner, DE filter, Hayward 1.5HP super pump, waterfall, frog system, gas heater

  2. Back To Top    #2

    Join Date
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    Re: Can this be mustard algae?

    Did you SLAM your pool or do a 1 time add of shock (the product)?
    TFP Moderator Chris V. ~16K Pool & Spa, 48NSF DE, IG Plaster Circa 2000, Intermatic PE653, Challenger pump with a 2 speed B2984, 20gal stenner chlorine injection, Houston, TX
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  3. Back To Top    #3
    Butterfly's Avatar
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    May 2007
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    Re: Can this be mustard algae?

    You can do an OCLT and rule out/in organics. http://www.troublefreepool.com/conte...loss-test-oclt
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    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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    Mod Squad zea3's Avatar
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    Jul 2009
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    Re: Can this be mustard algae?

    Has your chlorine dropped below 6 ppm at any time lately? Your CYA is high so your recommended FC range is 6-11 ppm.
    TFP Moderator
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    Vogue 21' round AG, Pentair 1 hp 2 speed pump, 36 sq ft DE filter, Hayward S180T 150# sand filter, Houston, Texas
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  5. Back To Top    #5

    Join Date
    Jun 2014
    Location
    Morristown, NJ
    Posts
    6

    Re: Can this be mustard algae?

    It was just a normal shock...I did not SLAM. My chlorine has not dropped below 6ppm. Looks like this is going to be a little tougher than I hoped.
    25k gallon vinyl liner, DE filter, Hayward 1.5HP super pump, waterfall, frog system, gas heater

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