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Thread: Please confirm need to shock

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    Please confirm need to shock

    I think I need to shock my pool, but am looking for someone else's opinion (besides my own) to confirm.

    We got a rain storm through the other night. The next morning, my pH had moved from 7.4-7.5 to almost 7.8. Then, the water started getting cloudy, and has slowly started getting a greenish tint.

    Test results:
    FC: 6
    CC: 0
    pH: 7.5 - 7.8, closer to 7.8
    CYA 40
    OCLT: -2

    I know, I know .... OCLT of -2 and green water should be a no brainer to shock. What I can't figure out is the CC of 0. Why is the CC test registering no combined chlorine if there's obviously green in the water? The CC has not moved from 0 since the rain storm.

    Am I right to shock the pool? And if so, what's up with the CC test?
    Thanks,

    Kansas City, MO area
    13,500 gal AG vinyl
    55GPM Waterway sand
    1HP MaxFlow pump
    Intex SWCG

  2. Back To Top    #2
    AnnaK's Avatar
    Join Date
    Jul 2007
    Location
    Eastern Pennsylvania
    Posts
    1,134

    Re: Please confirm need to shock

    If I had water with a green tinge I'd pour in a jug of bleach regardless of the CC test results. If OFCL means overnight chlorine loss and you lost 2 ppm, that's a clue that something isn't right.
    AnnaK

    12,500 gal AGP, Hayward sand filter, Pentair 2-speed pump, timer.
    Please visit our Pool Issues pages for information about step weights, managing the solar cover, and PoolSkim.

  3. Back To Top    #3

    Re: Please confirm need to shock

    Quote Originally Posted by AnnaK
    If OFCL means overnight chlorine loss ...
    Oops -- not sure what my brain was typing. I corrected that.
    Thanks,

    Kansas City, MO area
    13,500 gal AG vinyl
    55GPM Waterway sand
    1HP MaxFlow pump
    Intex SWCG

  4. Back To Top    #4
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Please confirm need to shock

    No question, definitely shock. CC can stay at zero the entire time you have algae often enough. CC at zero doesn't really tell you anything.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  5. Back To Top    #5

    Re: Please confirm need to shock

    Okay, loading up the wagon with bleach.

    Thanks, Jason!
    Thanks,

    Kansas City, MO area
    13,500 gal AG vinyl
    55GPM Waterway sand
    1HP MaxFlow pump
    Intex SWCG

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