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Thread: black algae

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    black algae

    Greetings from Sacramento, CA. I just returned from the pool store (again ) to test water and ask about getting rid of some Black Algae. They recommended shock, wire brush, 24 hrs, black algaecide, brush, shock, clarifier, shock, maintenance algaecide... $100 later. I also have some light green algae on walls and swim outs.

    I am sick of pouring $$$ into the water only to have problems return. HELP!!!

    23k gal., sta-rite system 3 cartridge filter, ozonator, Frogger mineral pack. Water tested as follows:

    FAC, TAC 1ppm
    pH 8.0
    TA 130
    CYA 25
    Calcium 300
    Phosphates 200

  2. Back To Top    #2

    Join Date
    Jun 2012
    Howell, NJ

    Re: stebenz4

    First step is to return the algaecide, shock (unless it is liquid shock), and clarifier. Next step is to order the recommended test kit. While you are waiting for the test kit, read up in pool school, especially anything about algae, the ABC's of pool chemistry, and SLAM. After you get your test kit, post up a full set of results, and we will go from there. For now, add enough liquid chlorine or bleach to keep your FC above 2 at all times.
    7 year old ~13,500 gal 24' AGP with 1.5 hp Proline pump, 150 sqft Pleatco cartridge, filled with well water with pH of about 4.5.
    Wanda the Whale pool vacuum, home made heater, Taylor K-2006
    Cloudy Pool? 1) Order test kit. 2) Follow SLAM
    New to TFPC? Read Pool School a few times, then post questions. PoolMath will help with chemical additions.

  3. Back To Top    #3
    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: black algae


    You've been pool-stored.

    We can help you out of that vicious cycle of chemical dependency.

    Step one: order a proper test kit. Best value is the TF100, which can be ordered from or Pool Supply World in California.

    Step two: get some bleach in that water now. At least one jug of 8.25% Chlorox, just to hold things steady for now. Add that much every day until your kit arrives.

    Step three: Add enough acid - dry or liquid, whatever you have around - to lower pH to about 7.4. can do the math.

    Step Four: Start reading Pool School

    Step Five: Hopefully by the time your kit arrives, you will have realized how totally useless the pool frog and the ozonator are, and will remove/shut off/empty/do whatever it takes to disable them. There's a chance that what you think is black algae could be metal stains, thanks to the pool frog. Does it look anything like the pictures in this thread?

    Step Six, when the test kit arrives, run all the tests and post results here and someone will be along to guide you. For sure the SLAM process is called for, but don't just immediately jump into that; you might need to fine-tune pH and/or drain some water first.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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