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Thread: Are these safe swim numbers?

  1. Back To Top    #1

    Join Date
    May 2014
    Location
    Toronto area, Canada
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    12

    Are these safe swim numbers?

    Hi All

    I'm part way through my first SLAM after recently discovering this site. My wife just told me she is having some kids over for a swim tonight and I'm wondering if I need to tell her to cancel.

    Here are my numbers:

    FC - 12
    CC - 0.9
    PH - 7.8
    CYA - 5
    TA - 120


    I've read here that you are safe to swim "up to shock level", but the CYA/Chlorine chart doesn't show FC values for such a low stabilizer level.

    Thanks

  2. Back To Top    #2
    Richard320's Avatar
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    Jan 2010
    Location
    San Dimas, CA (LA County)
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    18,768

    Re: Are these safe swim numbers?

    FC below 10 should be fine. That's shock level for zero CYA. With no CYA, you'll be down well below that after a day in the sun.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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  3. Back To Top    #3

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    Donldson's Avatar
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    Jun 2009
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    NW Ohio
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    Re: Are these safe swim numbers?

    Your numbers look very "pool-storeish" so they are suspect as to their accuracy. In fact the chart doesn't go that low because you cannot really measure that low of CYA.

    As Richard said, it will drop below 10 today if the pool gets any sun. Your CYA is probably somewhere between 0-20 so under 10 is plenty safe. Could cause the mild itching and crunchy hair if the CYA is truly zero, but no worse than a public pool.

    Just to be sure though, you can see the entire bottom of the pool, correct? That is the really important safety consideration!
    JD - 28' Round Above Ground Pool, 17,000 Gallons. Dual speed Jacuzzi pump with cartridge filter. Dual speed 1 HP pump, Hayward S210T sand filter
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  4. Back To Top    #4

    Join Date
    May 2014
    Location
    Toronto area, Canada
    Posts
    12

    Re: Are these safe swim numbers?

    Thanks for quick replies.

    Those numbers are from the pool store. My TF-100 just arrived and I'll be doing my first "real" test when I get home today. Water is very, very clear now - thanks to the help found here.

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