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Thread: Black Algae! Help!

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    Black Algae! Help!

    Hi.

    New to this forum and hope someone can help.

    Pool is roughly 10m x 5m. 2m deep at the deep end and concrete painted.

    We didn't manage to get the leaves out before we closed it last year and, of course, when I opened it this year it was green pea soup. After about 3 weeks the water finally cleared, but we were left with black algae on the bottom and it's spreading!

    I don't want to have to empty the pool (water is metered).

    I'm thinking bleach bleach bleach and lots of Chlor choc. Am I going in the right direction?

    Photo attached.

    TIA
    Frustrated Pool Owner in SW France
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    duraleigh's Avatar
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    Re: Black Algae! Help!

    That's not black algae but rather organic staining from leaving the debris in the pool.
    I'm thinking bleach bleach bleach and lots of Chlor choc. Am I going in the right direction?
    That sounds very correct. Bleach and Clorox are the same thing.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Black Algae! Help!

    Quote Originally Posted by duraleigh
    That's not black algae but rather organic staining from leaving the debris in the pool.
    Really? Well that's a relief!

    That sounds very correct Bleach and Clorox are the same thing.
    Sorry - what I meant was Bleach and Shock. Chlor Choc is the French translation.

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    Re: Black Algae! Help!

    Removing that stain will not be overnight. I would suggest simply elevating your chlorine level to about twice normal and keeping it there until the stains go away. Brushing often will likely help.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Black Algae! Help!

    Quote Originally Posted by duraleigh
    Removing that stain will not be overnight. I would suggest simply elevating your chlorine level to about twice normal and keeping it there until the stains go away. Brushing often will likely help.
    And just under 2 weeks later!

    Thanks for your help!
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    Casey's Avatar
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    Re: Black Algae! Help!

    Nice! This year, close it right and you won't have that nasty pool to deal with next year!
    I'd bet you my bikini you'll never get TFP water from a pool store!

    24' Sharkline Venture De Filter

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