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Thread: Safe FC level to swim?

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    Shpigford's Avatar
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    Safe FC level to swim?

    We've been on a two week journey of shocking our pool and now that it's nearly 100 degrees, the family is ready to swim (plus, my wife is wanting to have a pool party in a couple of days).

    So now that our pool is clear, what is a safe FC level to swim at?

    Here are my current test results:

    FC - 16
    CC - 0
    pH - 7.3
    TA - 90
    CH - 130
    CYA - 28
    22,000 gallon vinyl in ground with Hayward S244T sand filter and Hayward 3/4 hp Super Pump.

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    Butterfly's Avatar
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    Re: Safe FC level to swim?

    We consider anything from minimum up to shock level, based on your CYA, just fine for swimmin'
    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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    Shpigford's Avatar
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    Re: Safe FC level to swim?

    Quote Originally Posted by Butterfly
    We consider anything from minimum up to shock level, based on your CYA, just fine for swimmin'
    Wouldn't my shock level, based on my CYA, be 10-12? Making my FC of 16 a bit too high?
    22,000 gallon vinyl in ground with Hayward S244T sand filter and Hayward 3/4 hp Super Pump.

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    JasonLion's Avatar
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    Re: Safe FC level to swim?

    Yes, too high. Shock level for CYA at 28 is 12, and you are above that. With CYA at 30 it shouldn't take it too long to come down.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: Safe FC level to swim?

    I would not worry about a 16ppm FC level. When I worked on the pools in a local water park, someone accidentally left the feed for the bleach completely open overnight. FC was around 50ppm. We did not use CYA either... The guests didn't notice, and the only adverse affect we had was that the lifeguards' bathing suits were faded in a perfect line up to their hips .

    We had to use a lot of thiosulfate that night..

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