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Thread: Pool grout

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    Pool grout

    Is it possible to regrout a pool? I'm sure the wrong grout was used during construction. Is it costly? The iron in the water has turned the grout brown.

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    frustratedpoolmom's Avatar
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    Re: Pool grout

    If it's iron, you can do an AA treatment. Is the staining all over or only at the waterline?

    Take a Vitamin C tablet and place it on the stain (make sure this is under the waterline) and see if you get a reaction. If it's iron, the tablet will make it fade away and then you'll know the AA treatment will work.
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    Re: Pool grout

    I did an acid cleaning a year ago. The problem has now returned.

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    JasonLion's Avatar
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    Re: Pool grout

    Stains on the grout usually come from either organic staining, or metals stains, either of which will stain any kind of grout.

    There are two kinds of acid cleanings: muriatic acid (which treats calcium scaling and copper) and ascorbic/citric acid (which treats iron stains). Do you know which one you did before?
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    Re: Pool grout

    I'm sure it was ascorbic acid. The real question is, can a pool be regrouted? Is it a costly job? What kind of grout should be used. My neighboors both have pools built by the same company but with different workers. They have the same water supply and do not have a problem.

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    frustratedpoolmom's Avatar
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    Re: Pool grout

    The problem isn't necessarily the water itself but what happens once the water is in your pool, as every pool is unique. If your pool had a higher PH even for a short time it could result in staining. If your neighbor didn't experience the high PH or their iron count was somehow less, that could explain why they didn't see staining.

    Regrouting won't solve the problem... it's just a bandaid and the same result can occur. You have to figure out what caused the staining to begin with to prevent it from happening to the new grout.

    You should be able to treat the staining without regrouting, and then prevent the problem from repeating.

    If Absorbic Acid worked the last time, it's likely from iron. Repeating the process should remove it, and then using sequesterants and monitoring your PH levels to prevent the iron from redepositing in the grout.

    Did their water come from the same water supply as your's?
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    JasonLion's Avatar
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    Re: Pool grout

    Yes, a pool could be re-grouted, but that would be outrageously expensive. It would probably cost less to chip the tile off completely and re-tile.

    I really don't think it has anything to do with the kind of grout used. It has to do with maintaining the correct chemical balance.
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