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Thread: Pool turned milky and opaque overnight

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    Pool turned milky and opaque overnight

    Since we cleaned up our swamp about a month ago, we've had perfectly balanced, crystal clear water. I did a full test 3 days ago and all the numbers were in range. Daily pH and chlorine tests on Wednesday showed 7.5 and 6ppm. We woke up this morning to a completely opaque, milky white pool. All the numbers are still the same except chlorine which is down to 0. (CC 0.5)

    What happened? I'm running out for chlorine now to shock the pool, but I would love to understand what caused this. As I understand, dead algae would make the pool milky, but I never had anything but clear water.

    The other numbers are:

    ph 7.2 (this had been hovering at 7.5 until this morning)
    TA 110
    CH 230
    CC 0.5
    FC 0
    CYA 40
    16x32 Vinyl IG, 1HP Hayward pump, 24" Triton sand filter, Hayward heater

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    Mod Squad JohnT's Avatar
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    Re: Pool turned milky and opaque overnight

    My first guess is the beginning of an algae bloom. Sometimes cloudy water is the first sign of algae, and 0 FC is an invitation.

    The other possibility is something found its way into the pool that clouded the water and consumed the chlorine.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Re: Pool turned milky and opaque overnight

    Thank you for your very quick reply. I'm going to shock to pool now, but should I also get an algaecide, or just wait and see what the shock does?
    16x32 Vinyl IG, 1HP Hayward pump, 24" Triton sand filter, Hayward heater

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    duraleigh's Avatar
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    Re: Pool turned milky and opaque overnight

    Algaecide is not particularly helpful to shock. By far, the best product to shock a pool is Clorox or liquid chlorine.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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