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Thread: Shock Levels

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    Shock Levels

    I'm still fairly new to the site but I can't seem to find the answer to safe chlorine levels. I understand the recommended levels and how certain factors require more FC for balance. But I've also read that one should avoid swimming in levels above certain thresholds. When I look at the recommended shock levels, and the direction to maintain them, I want to know when it is OK to swim. Am I misunderstanding the directions or have I been basing my assumptions on a myth?
    Southeast Georgia
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    aa62579's Avatar
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    Re: Shock Levels

    I am not sure I understand what you are asking. You shouldn't swim if you are having to shock your pool. Once you have completed the shock process and your FC level drops below shock level, then it is safe to swim. Based on your CYA level, you will have a target minimum FC, a target "ideal" FC, and shock FC.
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    Richard320's Avatar
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    Re: Shock Levels

    Is this what you were looking for?

    It all depends on the stabilizer level.
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    Re: Shock Levels

    What I am attempting to ask is "when is it safe to swim". According to that chart, my target FC is 7 and my shock level 24. When I have successfully "shocked" the pool and I have maintained the shock level, how long before it is OK to swim. For example, if the next day the reading is down to 19, is it OK? I have read where commercial pools will close with readings above 10. At what level would you not allow your children to swim?
    Southeast Georgia
    IG 27,000 gallons w/ flow over spa
    Diamond Brite
    74 gpm Sand Filter
    2HP Pump

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    Richard320's Avatar
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    Re: Shock Levels

    Commercial Pools aren't allowed to run with CYA in them, or not much if they do.
    10 FC with 0 CYA is somewhere like 50 with 50 CYA - just a huge number. Don't quote me on that, it was just a number I grabbed out of thin air as an example. Chem Geek has posted an equivalence chart somewhere, and I searched for it, but he's such a prolific poster I gave up.

    If minimum FC is 7, I'd probably swim in it up to 14. But that's after all 3 conditions for saying the shock process is finished have been met.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Butterfly's Avatar
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    Re: Shock Levels

    Quote Originally Posted by bill5416
    What I am attempting to ask is "when is it safe to swim". According to that chart, my target FC is 7 and my shock level 24. When I have successfully "shocked" the pool and I have maintained the shock level, how long before it is OK to swim. For example, if the next day the reading is down to 19, is it OK? I have read where commercial pools will close with readings above 10. At what level would you not allow your children to swim?
    Assuming you have completed the shock process (see red line in my sig), it is safe to swim when your FC is above the minimum and below shock level based on your CYA.
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    Mod Squad Bama Rambler's Avatar
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    Re: Shock Levels

    You can swim up to shock level once the OCLT has been technically passed. I wouldn't be afraid to let anyone swim up to shock level.
    Dave J. TFP Moderator
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