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Thread: Algae Spots on Waterline Tile

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    Algae Spots on Waterline Tile

    It has not been particularly problematic but every few days I have small round algae spots (black algae I would assume) that show up on the grout lines between the waterline tiles around the pool. Its typically in more shadow prone areas, corners and about an inch or two above the waterline so its not getting much contact with chlorine. What is the best preventative treatment for this? Regular brushing is what I do now but they grow back.

    Brian
    30,000 Gallon Renovated Pool and Spa
    Flagstone Coping and Wall
    Onyx Quartz Plaster
    72 SF D.E Filter
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    Butterfly's Avatar
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    Re: Algae Spots on Waterline Tile

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    Re: Algae Spots on Waterline Tile

    Are you brushing with a fairly strong chlorine solution?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: Algae Spots on Waterline Tile

    Thanks for the bump there Butterfly.

    Quote Originally Posted by duraleigh
    Are you brushing with a fairly strong chlorine solution?
    No, I have simply been brushing every three days or so. Should I maybe use a spray bottle of bleach? Are the spots fairly typical as I have described by the way? I have zero algae in the pool other than these spots on the tiles with water test results pretty close to what would be described as ideal for all categories.

    Brian
    30,000 Gallon Renovated Pool and Spa
    Flagstone Coping and Wall
    Onyx Quartz Plaster
    72 SF D.E Filter
    Polaris 280 Cleaner
    Jandy Aqualink Control Center and Palm Remote

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    Re: Algae Spots on Waterline Tile

    Since it resides above the waterline, I doubt it's algae but rather some kinda' mold, fungus, moss, etc.

    Regardless, I would mix about a 50/50 solution of clorox in a plastic spray bottle and spray it down. My guess is you'll have to do it every couple of days for a while (brushing in between) but I'll be pretty surprised if the chlorine doesn't kill it.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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