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Thread: Algae Growth On Grout Below Water Line

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    waldrondigital's Avatar
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    Jun 2014
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    Simi Valley, CA
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    Algae Growth On Grout Below Water Line

    Our Breeze SWG cell wasn't producing chlorine at an acceptable level, so I replaced it which solved the issue. FC was almost non-existent for a brief time, but is around 4 now.

    I'm having issues with minor bright green algae growth below the water line on the grout. I've brushed it off twice, but it comes back after a few weeks in certain low light spots. It's not pervasive.

    What are thoughts on using this method to kill it?: How To Clean Algae From Swimming Pool Tile Grout - INYOPools.com

    Any other suggestions? I saw about spraying bleach, but it seems that that is geared to algae ABOVE the water line, and obviously I can't spray underwater. Although I suppose I could let the water level fall so I could get to the affected areas with a sprayer.

    It's growing in the shaded area of this picture:
    Pool.jpg

    Thanks TFP!
    In-ground plaster 17k gallon pool & spa with flag stone decking, Jandy DEL60 Filter, Pentair Intellifo Pump, Jandy RS6 Controller, Jandy LX400N-L Heater, Zodiac MX-6 Robot, SGS Breeze SWG.

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    Mod Squad YippeeSkippy's Avatar
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    Re: Algae Growth On Grout Below Water Line

    What are your test results?

    Maddie
    Maddie :) 12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
    Skippy's Pool Cooler --> Skippy's New Fountain Our Build --> Our Pool Solved Our Sloping Yard

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    duraleigh's Avatar
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    Apr 2007
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    Sebring, Florida
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    Re: Algae Growth On Grout Below Water Line

    Lowering the water is the best cure.

    More chlorine is the preventative
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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