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Thread: Blue spotting on white plaster

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    Blue spotting on white plaster

    I'm getting blue spotting on my white plaster. The plaster itself was redone last year and it started getting these blue spots late last summer. Chemistry is normal (chlorine). Its on both the horizontal and verticle surfaces. Anyone know what this is?
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    15,300 gal., AG, sand filter, 1HP 2 speed pump, 40 GPM.

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    Re: Blue spotting on white plaster

    Please post a full set of test results. Without them we really cannot tell much.

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    Butterfly's Avatar
    Join Date
    May 2007
    South Carolina

    Re: Blue spotting on white plaster

    Have you had your water tested for metals?
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

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