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Thread: Black Algae

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    Black Algae

    I have a 30 thousand gallon pool. I have an in ground pool with a vinyl liner. My filter is old it has 3 cartridges in it. When I left an we had a little bit of black algae spots but when I returned almost the entire pool liner was black. I put 4 1/2 pounds of black algae in it and 6 pounds of super shock. I scrubbed it twice today and I have a few spots that are cleaned. I am breaking my back is there anything else I can do? How long does it take to get rid of this. Please help.
    Thank you,

    San Diego, CA
    24,000 gal. 15x40 IG plaster
    Hayward Star Clear Plus 120sq.ft. cartridge filter
    1.5 HP
    In line chlorinator using triclor

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    frustratedpoolmom's Avatar
    Join Date
    May 2007
    SWSuburban Chicago, IL

    Re: Black Algae

    Hi, algae can be really difficult to get rid off, especially if you are not following the instructions to properly shock your pool.

    Can you tell us what products, exactly you used?

    Also, if you can post a complete set of test results, we can help you better. In the meantime, read the articles in pool school to get you started.

    IT's going to take a lot of chlorine/bleach to kill the algae, and if it is "black algae" alot of back breaking elbow grease brushing your pool daily....

    But it can be dealt with, if you learn the proper water chemistry and technique, which is not as difficult as it seems now, I'm sorry you are feeling overwhelmed.

    We'll do our best to help you!
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Black Algae

    Pressure washing the "heads" off of the black algae while at shock level can help dramatically. To get the same effect manually you need to brush several times a day. When brushing you don't have to brush really vigorously, just brush lightly and very frequently. Brushing exposes the deeper layers so that the chlorine can work on them. It takes a while to get down to the roots unless you pressure wash.
    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

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