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Thread: White Chalky Substance

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    White Chalky Substance

    Hi guys, I have a two part question.

    When brushing the pool I've noticed a white chalky substance dispersing.

    Normally, only noticed it when brushing the steps of my plaster pool. Yesterday was the first time we braved the frigid pool temperature, in which we noticed the bottoms of our feet were white and the pool surface was slick to the touch and to walk on.

    Here's the question, any idea what it is? Is it normal? If not normal, how to get rid of it?

    My filter was cleaned by a pool professional in January and we recently did a backwash.

    Below is a picture of my hand after touching the pool surface:



    Thanks for the help


    Plaster, 2 HP WhisperFlo Pump, DE Filter

  2. Back To Top    #2
    Mod Squad pooldv's Avatar
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    Re: White Chalky Substance

    Please post a set of test results and what test kit you are using. An older set or two of test results would also help.
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  3. Back To Top    #3

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    Re: White Chalky Substance

    Test results from 4/8 except when noted:

    FC: 6.5 (4/15)
    CC: 0
    pH: 7.6 (4/15)
    TA: 80
    CYA: 40
    CH: 320

    Everything is stable except for my pH which fluctuates D/T an attached spa. The TA ranges between 70-80 depending on when acid is added for the pH.


    Plaster, 2 HP WhisperFlo Pump, DE Filter

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    Mod Squad pooldv's Avatar
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    Re: White Chalky Substance

    Your test results look pretty good and don't indicate any other issues. White, chalky residue without indications of scale or other issues in a plaster pool tends to come from paint failing in a plaster pool. We don't recommend painting a pool because the paint only lasts a couple of years and then it makes a mess, becoming chalky, peeling, etc.
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  5. Back To Top    #5

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    Re: White Chalky Substance

    Was your pool painted?

    Is this residue on the entire submerged part of the plaster [walls, bottom, steps, etc] or in select places only?
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  6. Back To Top    #6

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    Re: White Chalky Substance

    The house is a rental, pool was in poor shape when we moved in. The plaster is chipped or actively chipping throughout the entire pool and spa.

    And the white, chalky substance is on every part of the plaster that is submerged (walls, steps, spa, floor bottom). The walls and floor are slick to the touch as well.


    Plaster, 2 HP WhisperFlo Pump, DE Filter

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    Patrick_B's Avatar
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    Re: White Chalky Substance

    I agree, and curious about the question of it being painted. Looks like it may have been. If so, it wont get any better I'm sorry to say. Looks like a re-plaster in your future.
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