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Thread: black algae options to kill it.

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    Join Date
    Jan 2010
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    Claremont california
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    black algae options to kill it.

    Hello,
    I have a black algae problem. It has been getting better but the black little spots (1/4) inch will not go away.
    This is what I have done:
    1. Shock to 50 FC
    2. Brushed with stainless steel brush
    3. Emptied 30% of water from pool.
    4. Ran to pump 24 hours for two days.
    I am getting very frustrated but what should I do? Should I shock back to 50FC?
    Please advice,

    The details about my pool: PLASTER 30K NONE SALT WATER POOL IN GROUND /PH 7.4 CYA 80 /CURRENT FC 25/ ESTIMATED WATER VOLUME IN POOL IS ABOUT 18K GALLONS.
    I thank you so much for any advice,
    George from Claremont California.
    22k plaster pool kidney shape. Pentair 4000 de series 48 ft. 2 SKIMMERS, 2 drains (pool and spa), 3 returns (2 pool and 1 spa) gas heater and pentair intelliflow , Underwater pentair light.

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    X-PertPool's Avatar
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    Re: black algae options to kill it.

    Maybe treating the spots directly for example using a tri tab as a scrub pad.
    -Kevin
    X-Pert Pool Service
    x-pertpool.com
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    22,000 gal / 16' x 32' / Vinyl / Hayward s244t /Pentair SuperFlo 1 hp

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    dmanb2b's Avatar
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    Re: black algae options to kill it.

    PH 6.4 is that a typo? If not you should raise it to 7.4 with borax asap. Are you sure it is BA? Try rubbin the affected area with a trichlor puck and see if it subsides, if so we'll know it's in fact organic and not metal staining.
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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  4. Back To Top    #4

    Join Date
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    Claremont california
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    Re: black algae options to kill it.

    Quote Originally Posted by dmanb2b
    PH 6.4 is that a typo? If not you should raise it to 7.4 with borax asap. Are you sure it is BA? Try rubbin the affected area with a trichlor puck and see if it subsides, if so we'll know it's in fact organic and not metal staining.

    Yes, the 6.4 is a typo. The actual value is 7.4.

    I will jump in to the pool and see if the actual black spots are BA.

    Thanks for your help!

    George
    22k plaster pool kidney shape. Pentair 4000 de series 48 ft. 2 SKIMMERS, 2 drains (pool and spa), 3 returns (2 pool and 1 spa) gas heater and pentair intelliflow , Underwater pentair light.

  5. Back To Top    #5

    Join Date
    Jan 2010
    Location
    Claremont california
    Posts
    100

    Re: black algae options to kill it.

    Quote Originally Posted by X-PertPool
    Maybe treating the spots directly for example using a tri tab as a scrub pad.
    Thanks,

    Why I did not think of that?

    George
    22k plaster pool kidney shape. Pentair 4000 de series 48 ft. 2 SKIMMERS, 2 drains (pool and spa), 3 returns (2 pool and 1 spa) gas heater and pentair intelliflow , Underwater pentair light.

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