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Thread: looks like moss in the pool

  1. Back To Top    #1

    Join Date
    Aug 2010
    tallahassee, florida

    looks like moss in the pool

    I have attached a photo of something growing on my concrete pool. It is soft, and a dark green color, although photo makes it look almost black. It grows generally on the north side of the pool, starting on the steps. My water chemistry has been good throughout the 6 years I have had the pool.

    I can scrape it off with a stiff brush. But then it re-seeds nearby when I scrub it. It is under the water, not above the water line.

    Is this moss, or some type of clumped up algae? I have had this for 3-4 years, but it's getting worse this year.

    Any help would be greatly appreciated.

    Attached Images Attached Images
    25k gallon pebble/shotcrete rectangular pool
    vs-svrs pump with pentair s8m500 cartridge filter
    Intellichlor 40 and UPP25 ozonator;2.5" plumbing
    automated security cover- polaris 280 used infrequently
    8 floor returns, 2 wall returns, 3 lion head spout returns
    pool built summer 2010, city water filled Aug 10, 2010

  2. Back To Top    #2
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    DFW, TX

    Re: looks like moss in the pool

    It is probably regular old algae. I would SLAM to kill it. If it persists you can read up on this, Pool School - Black Algae
    TFP Moderator
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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