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Thread: Black algae

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    Black algae

    New to forum.
    I don't see a lot about black algae but I did see something that was saying not to use black algae killer. I have a pool service. He says he has kept the chlorine levels up but the black algae is spreading. I was going to get a product and he said he would add it and scrub the algae with a metal brush. Now what I'm reading here makes me wonder what the right treatment is.

    Please let me know. Sorry if this is already here, I don't have time to go through every post.

    Plaster, in-ground 40,000 gallon.Clean and clear plus Large 4 cartridge filter.

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    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: Black algae

    Scrubbing with the metal brush is the correct way of getting rid of it. However a once a week pool service isn't going to cut it. You need to brush it more than that.
    Also, there's no telling how high your CYA is and therefore you may not have nearly enough FC in the pool to keep it from spreading.

    You'll do yourself a favor by reading Pool School and learing to take care of your pool yourself.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  3. Back To Top    #3

    Re: Black algae

    Thanks......I took care of the pool myself for 45 years, including acid washing it MYSELF. I am no 68 and am not up to doing it anymore. I thought I saw here that one shouldn't use an algicide so wanted to know what to tell the pool caretaker.
    Plaster, in-ground 40,000 gallon.Clean and clear plus Large 4 cartridge filter.

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    Join Date
    Feb 2008
    Flower Mound, TX

    Re: Black algae

    Welcome to TFP!

    We don't recommend algaecides because, by and large, they aren't needed. A properly chlorinated pool doesn't get algae and doesn't need algaecide. If you have black algae in your pool, your pool service isn't cutting it. This is why we suggest taking care of it yourself using the methods suggested herein.
    10K gallon IG gunite with waterfall; Pentair CC320P filter; WhisperFlo 2 HP pump
    TF Test Kits - Pool Math - Pool School
    "It depends."- JohnT

  5. Back To Top    #5

    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: Black algae

    You could see if the pool service was willing to just come by and do the heavier labor items such as brushing the pool, cleaning the filter, etc. If you handle the chemicals yourself, it's just adding some chlorinating liquid or bleach every day or two. On the other hand, if that's too heavy to carry, then if the pool service uses the chemicals, they may need to use an algaecide to prevent algae growth because they are only dosing once a week or are using Trichlor pucks which build up CYA over time.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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