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Thread: black algae on calciaum

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    black algae on calciaum

    just above my water line, i have some build up of white scale which i believe is calcium on my pebble tec. on that build up i have black splotches that turn bright green when the chlorine dips a bit. then i typically raise the water line to cover the green then boost the chlorine.

    i was told this was black algae at my neighborhood pool store. it was recommended i let the water line drop then attack the build up with a pumice stone to remove the build up and ultimately the black algae.

    just wanted to get a 2nd opinion on the best way to remove the build up and also the black algae?

    thanks,
    1) 16,000 gallons
    2) cartridge
    3) in ground
    4) Pebbletec (Shasta stone)
    5) If you know, tell us the size pump and the size (flow rate) of your filter. Need to find out.

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    duraleigh's Avatar
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    Apr 2007
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    Sebring, Florida
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    Re: black algae on calciaum

    It sure sounds like you have algae and calcium scale. Whether it's black algae or not, the conditions that have caused it will return unless you get your chemistry in check.

    I would do that first and then clean up the scale.
    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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    May 2007
    Location
    Silver Spring, MD
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    37,879

    Re: black algae on calciaum

    If you post a full set of water test results, we can give you much more specific advice.
    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

  4. Back To Top    #4

    Re: black algae on calciaum

    hi jason,

    my water test from yesteray at leslies pool store
    free chlorine 4
    total chlorine 4
    Salt 2600 ( irrelevant because my salt cell is dead, using chlorine tabs)
    cyanuric acid 99
    total alkalinty 80
    pH 7.4
    phosphates 200


    since the test they had me add 9 oz of phosfree.
    1) 16,000 gallons
    2) cartridge
    3) in ground
    4) Pebbletec (Shasta stone)
    5) If you know, tell us the size pump and the size (flow rate) of your filter. Need to find out.

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