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Thread: I think I have Black Algae

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    Default Re: I think I have Black Algae

    ??

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    BigDave's Avatar
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    Default Re: I think I have Black Algae

    I presume "??" is the same as "Bump".

    I agree, it sounds like black algae. That seems to be tough to clean. You can search for black algae threads using this link: http://pool9.net/search/. Basically you'll need shock FC levels and regular brushing to disrupt the black algae protective coating. Don't try to shock with the SWCG - it'll shorten it's life. We recommend bleach to shock as it adds chlorine, salt, and almost nothing else.

    A couple comments,
    The FC of 5ppm is pretty low for CYA of 90ppm, OK with the SWCG but near the edge. This can allow algae to grow where the water doesn't move much.

    pH is a bit high and TA is a bit high with CH 370. I'd bring down TA using the Acid / Aerate process described in this link: http://pool9.net/alk-step.

    My comments are based on the pool store test which we do not trust. I strongly recommend you get the Taylor K-2006 test kit. You will need it to fight the algae and to control the pool. It's not available in stores. If you order it through these links http://pool9.net/tk/, PoolForum gets some coin to keep the lights on. You may also want to order the salt strips (about the only strips we recommend).

    Let us know how it's going.
    12'x24' oval 7.7K gal AG vinyl pool; ; Hayward S270T sand filter; Hayward EcoStar SP3400VSP pump; hrs; K-2006; PF:16

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    CarlD's Avatar
    CarlD is offline SuperMod Emeritus Vortex Adjuster CarlD 4 stars CarlD 4 stars CarlD 4 stars CarlD 4 stars CarlD 4 stars CarlD 4 stars
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    Default Re: I think I have Black Algae

    I'd make one adjustment to BigDave's advice.

    FIRST, bring your pH down to about 7.2/7.3, or even as low as 7.0, then measure your T/A again. Dropping pH from 8 to the low 7's should bring down the T/A as well.

    Your target shock level for your CYA level, is 20ppm, but, personally, with black algae on a hard-sided pool, I'd go to much higher levels, as high as 40ppm, to kill that junk. But that's me.
    Carl

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