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Thread: Need to shock?

  1. Back To Top    #1

    Join Date
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    Need to shock?

    Plaster pool with SWG. Have pH around 7.4. Checked CYA 1 week ago, was at 40-45. Added stabilizer, but have not re-checked. Should now be in neighborhood of 70.

    Shocked pool prior to bringing up CYA. FC was 20. After shocking, turned off SWG for a day, then turned back on. Had pool party 2 days ago. Checked FC after party, was at 6. Kept SWG on.

    Today (2 days after party), water is turning cloudy. Checked Cl again. FC at 3 and CC at 0.5.

    We've had pool for 3 years, only time water has gotten cloudy was when FC was near 0.

    Any idea why water is cloudy now? I'd understand cloudy water with FC of 3 and CC above 0.5 (but CC is 0.5).

    Given FL drop from 6 to 3 with SWG on, I assume I need to shock. With CYA probably around 70, do I need to bring FC all the way to 28 (based on CYA / shock table) given FC is measuring OK at 3?

    Thanks,
    Chad

  2. Back To Top    #2
    Richard320's Avatar
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    Re: Need to shock?

    Yes. We don't use that particular S word around here as a verb. You meant to type, "SLAM".

    The good news is, if the water is just hazy, the SLAM process could be over with in a day.

    Bring it up to SLAM. Brush the walls. Scrub the returns, the light, the skimmer inlet, anywhere algae spores may lurk. Recheck FC in a couple hours and replenish it. When you hardly lose any and the water is clear, then add the last dose a few hours before bed. Just before bed, shut off the SWG if you haven't yet, take a reading, and compare it the next morning before the sun comes up. Then either stop the SLAM or add more bleach and repeat the process the next day.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Divin Dave's Avatar
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    Re: Need to shock?

    ^^^^ what RIchard says
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
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    duraleigh's Avatar
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    Re: Need to shock?

    +2 what Richard 320 says.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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  5. Back To Top    #5

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    Re: Need to shock?

    Started SLAM. Water clear now. Thanks for the help.

  6. Back To Top    #6
    JasonLion's Avatar
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    Re: Need to shock?

    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

  7. Back To Top    #7
    Mod Squad jblizzle's Avatar
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    Re: Need to shock?

    Please realize that clear water is only one of the criteria to stop the SLAM process.
    Jason, TFP Moderator
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