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Thread: Tiny Stones Embedded in Gunite

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    Tiny Stones Embedded in Gunite

    Very small stones appear embedded in the gunite only on the pool stairs. The pool has been acid washed and the stones remain. Any ideas on what they are and how to eliminate them? Thnaks

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    Mod Squad kimkats's Avatar
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    Re: Tiny Stones Embedded in Gunite

    Are you saying you have not seen them before?

    You say gunite. Do you mean plaster?

    If you share a picture we might be able to understand what you are dealing with.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Re: Tiny Stones Embedded in Gunite

    Thanks for the response. Yes it is a plaster pool. They have been there for years (my brother's pool has the same thing). Most are black. Definitely not algae. I've attached an image. Thanks again.stones.jpg

    Quote Originally Posted by kimkats View Post
    Are you saying you have not seen them before?

    You say gunite. Do you mean plaster?

    If you share a picture we might be able to understand what you are dealing with.

    Kim

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    Re: Tiny Stones Embedded in Gunite

    Looks like black algae to me. Have you tried scratching it several times with your finger nail?
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    Re: Tiny Stones Embedded in Gunite

    Thanks for the response. Definitely not algae. This has been around for years even after an acid wash, bleach wash and power wash. Just recently I used a 3500 psi pressure washer and no change. Will not scratch off either.

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    Mod Squad kimkats's Avatar
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    Re: Tiny Stones Embedded in Gunite

    Can you feel them?

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Re: Tiny Stones Embedded in Gunite

    Completely smooth. Almost like it is part of the original plaster. Strange thing is that my brother has the exact same situation and they were different pool builders.

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    Mod Squad kimkats's Avatar
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    Re: Tiny Stones Embedded in Gunite

    Were the pools built about the same time? Do you have any idea if the plaster people were the same? Many PB use the same subs.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Re: Tiny Stones Embedded in Gunite

    Just looks like black algae to me.

    Your plaster looks old? How old?

    They may have been in the original plaster and creamed and troweled over. Now that the plaster has gotten older and the water has slowly eaten away the cream you see these. Its on the edge of the steps but not elsewhere in the pool?

    I suspect your plaster coat is thinner there.
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