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Thread: Possible Algae?

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    Hurricane Gio's Avatar
    Join Date
    Apr 2010
    Location
    Coral Gables, FL
    Posts
    197

    Possible Algae?

    Been real busy and have not had time to brush pool. Now form dirt and other organic matter blowing into the pool, I have black spots in the water, mainly on stairs, swim out and some spots on the floor. It's hard to brush off with a steel brush, especially on the grout lines. When brushed off, it's leaves a green spot. Is this algae?

    Water has been balanced and real clear.
    If it is, do I kill off with bleach or algae treatment?

    Thanks
    8,000 Gal, 11 x 26.8ft Shotcrete Pool with "Cool Blue" Diamond Brite by ESSIG Pools with Artistic Pavers Deck
    Goldine AQL-PLUS w/Aqua Pod, Aqua-Rite T-CELL-15 SWG, Pentair WhisperFlo High Performance 1.5HP, 2 speed pump, Pentair IntelliBrite,
    Pentair 100sqft Cartridge Filter, 6 Pool returns, Skimmer and 2 Anti-Vortex Main Drains
    Pool's completed build 2/2010

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    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
    Posts
    12,082

    Re: Possible Algae?

    Sound like it might be black algae. You might have poor circulation in those areas so when you aren't brushing the pool this slow-growing algae (technically, a cyanobacteria) takes hold. You can SLAM the pool and brush the affected areas regularly during the slam to expose the roots to elevated chlorine levels and that should kill it off.
    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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    Hurricane Gio's Avatar
    Join Date
    Apr 2010
    Location
    Coral Gables, FL
    Posts
    197

    Re: Possible Algae?

    Thanks. Yes, outset stairs is the worse area.
    8,000 Gal, 11 x 26.8ft Shotcrete Pool with "Cool Blue" Diamond Brite by ESSIG Pools with Artistic Pavers Deck
    Goldine AQL-PLUS w/Aqua Pod, Aqua-Rite T-CELL-15 SWG, Pentair WhisperFlo High Performance 1.5HP, 2 speed pump, Pentair IntelliBrite,
    Pentair 100sqft Cartridge Filter, 6 Pool returns, Skimmer and 2 Anti-Vortex Main Drains
    Pool's completed build 2/2010

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