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Thread: cleaning pool grout

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    cleaning pool grout

    I have a soaking size pool, outdoor, that has yellowed/orangeish staining on the grout above the water line. It was like this when we bought the house last year. How can I clean it off?

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    duraleigh's Avatar
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    Re: cleaning pool grout

    Welcome to the forum.

    Try a 3:1 solution water and muriatic acid (3 waters).

    It should foam up on contact, wear gloves, and scrub with a deck brush. Rinse quickly.

    I assume you have already tried an abrasive like Ajax and water, right?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    DaninFLA's Avatar
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    Re: cleaning pool grout

    Quote Originally Posted by duraleigh View Post
    Welcome to the forum.

    Try a 3:1 solution water and muriatic acid (3 waters).

    It should foam up on contact, wear gloves, and scrub with a deck brush. Rinse quickly.

    I assume you have already tried an abrasive like Ajax and water, right?
    well, i will second the part where you say "rinse quickly". muriatic acid is going to eat up the grout, cant leave it on long. I use a 50/50 of diluted bleach and spray it on and let it sit until it dries, and then rinse and scrub with a nylon brush and works great.
    Dan
    9,000 gallon in-ground Saltwater pool, plaster, cartridge filer, 1.0 hp pump, Hayward T-15 SWCG, TF-100
    Pool School - Chlorine / CYA Chart; Pool School - Test Kits Compared;

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    Re: cleaning pool grout

    The "yellowish/orange staining" that OP described didn't sound like algae, which chlorine will remove very, very well.

    It sound like calcium buildup which will require some form of acid to remove.

    A pic always helps
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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