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Thread: Algae growth on the bottom of the pool that won't go away

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    Algae growth on the bottom of the pool that won't go away

    I've been having trouble with algae growth on the bottom of the pool.
    The end of last week(19th) I checked my pool chemistry to conduct a over the night chlorine test:
    FC: 6
    CC: .5
    PH: 7.6
    Alk: 90
    Hardness: 110
    CYA: 30

    In the morning i had
    FC:5
    CC: .5

    I still shocked the pool since it was on the border. (3 gallons of beach to get to the 12ppm) I think it got to 14ppm.

    I brushed it on friday and saturday, missed yesterday.

    Today the whole botom is green again.

    the FC is 6 and the CC is .5

    I'm using a Taylor k-2006 test kit. Do I shock it again or am i not scrubbing good enough and I need to keep brushing? I'm new to this pool thing...
    21,000 Gallon Inground Vinyl Sport bottom pool
    Sand Filter

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    Mod Squad jblizzle's Avatar
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    Re: Algae growth on the bottom of the pool that won't go awa

    I think you are understanding the term "shock" incorrectly. [shock:2xgom9wx][/shock:2xgom9wx]

    It does not sound like you were maintaining the shock FC level the whole time based on what you wrote.
    Jason, TFP Moderator
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    Vette's Avatar
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    Jul 2012
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    Re: Algae growth on the bottom of the pool that won't go awa

    You need to hold it at shock level until the 3 criteria are met:

    • CC is 0.5 or lower;[/*:m:2b2rjcv7]
    • An overnight FC loss test shows a loss of 1.0 ppm or less;[/*:m:2b2rjcv7]
    • And the water is clear.[/*:m:2b2rjcv7]
    11,700 gallon 21' round 54" deep all-resin AGP - June 2012
    Waterway 1HP 2-speed pump / 100 sq ft cartridge filter
    Hayward 150,000btu Natural Gas heater
    I use and recommend the TF-100 for testing

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