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Thread: White dots that look like Black Algae but are white

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    White dots that look like Black Algae but are white

    I saw a pool today that had white dots that look like black algae but are white.

    The plaster is black.

    The patches of dots are in a couple of patches on the floor.

    What caused these dots? Bad plaster mix?

    Thanks

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    Mod Squad jblizzle's Avatar
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    Re: White dots that look like Black Algae but are white

    Calcium scaling? You want us to guess with no pictures or more info?
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    Re: White dots that look like Black Algae but are white

    It's hard to take a photo of it where it's at. It's looks just like black algae but it's light grey / white.

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    Re: White dots that look like Black Algae but are white

    They are dime sized dots.

    I was told that vigorous brushing with a stainless steel brush had no effect.

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    Mod Squad jblizzle's Avatar
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    Re: White dots that look like Black Algae but are white

    Maybe someone threw some granulated chemical in and it faded the plaster?
    Jason, TFP Moderator
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    Re: White dots that look like Black Algae but are white

    Are they bleached black algae spots?

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    Re: White dots that look like Black Algae but are white

    could be, but a brush should remove those easily. They do bleach gray/white.
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    Re: White dots that look like Black Algae but are white

    You might consider that they are either calcium nodules which begin as white bumps or mounds and then turn brown over time http://www.troublefreepool.com/threa...dules-in-Pools

    Or White spots that are very smooth on the surface http://www.troublefreepool.com/threa...-Plaster-Pools And http://www.troublefreepool.com/threa...aster-Spotting

    White spots can occur on white plaster or black plaster.

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    Re: White dots that look like Black Algae but are white



    This is it!

    Defective plaster.

    Thank you!

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    Re: White dots that look like Black Algae but are white

    Here is a photo with white spots on a black plaster pool.
    Attached Images Attached Images

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