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Thread: Black Algae

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    Black Algae

    I have black algae and am not sure if I should get my pool acid washed?
    28,000 gallons, in ground, plaster

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    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    Re: Black Algae

    Welcome to TFP!

    About half of the people who think they have black algae, actually have some other problem. Could you tell us why you think you have black algae?
    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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    Join Date
    Feb 2008
    Location
    Denton, TX
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    5,061

    Re: Black Algae

    Welcome to TFP!

    Black algae is persistent and takes dedication to get rid of, but it is not an indication to get your pool acid washed. Acid washing is indicated for cases of mineral scaling (even this is arguable) but not for algae eradication.

    Try reading Defeating Algae to get you pointed in the right direction. Basically, you need high levels of chlorine, water circulation, and lots and lots of brushing.

    Have you read Pool School yet? There is much information to be had there. When reading it, you'll begin to understand why you got algae in the first place, how to get rid of it, and how to never have it again.

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    Re: Black Algae

    They are pencil sized black spots that are slimy. I can scrape them off with my finger nail.
    28,000 gallons, in ground, plaster

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    dmanb2b's Avatar
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    Apr 2009
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    NY
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    Re: Black Algae

    Welcome to TFP....Read up on pool school as suggested. You'll need to raise your FC up to shock level, hold it at shock level and start brushing all the nooks and crannies.
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

    Pool School, TFTestKits, Pool Calculator

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    Re: Black Algae

    I read the Pool School on fighting algae, is there anything more specific to black algae? Is there a process I should follow?
    28,000 gallons, in ground, plaster

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    dmanb2b's Avatar
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    Apr 2009
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    NY
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    Re: Black Algae

    Nope...shock and scrub. But from your other thread, if you are draining your Pool...just take care of it then...bleach will kill it if it organic...I would think the acid would do a number on it too if you go the route of an acid wash. Question though...can you give us some back ground...why do you want to drain/acid wash the pool?
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

    Pool School, TFTestKits, Pool Calculator

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    frustratedpoolmom's Avatar
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    May 2007
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    Re: Black Algae

    The trick with Black Algae is the brushing - they have a tough outer shell that is resistant to chlorine. By brushing it, you knock the heads off so the chlorine can attack the insides. The outer layer can re-establish so you have to brush daily if not twice a day. The pool store will try to sell you a bunch of various 'treatments' which won't help and will likely make the situation worse. So just remember, chlorine and brushing. Lots of elbow grease.
    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
    http://www.PerfectlyClearPoolService.com

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