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Thread: Safe to Swim in High Chlorine levels

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    Safe to Swim in High Chlorine levels

    Hi all,
    I have been fighting a bit of yellow algae, hence some shocking has been going on in the last two days:

    FC: 24
    pH: 7.6
    TA: 100
    CH: 290
    CYA: 40
    CSI: .84
    Water temp: 86F, mostly on sun all day.

    I have two questions, when is it time to stop shocking? and, is it safe to swim with these levels of chlorine?
    THANKS!
    Michelle
    Built in 2014, 18,000gal, plaster, in ground, Pentair Clean & Clear Plus 2.0 HP, Booster Pump, Cartridge filters, inline chlorinator, automatic cleaner, Pentair MasterTemp 400 heater, Silencer for SPA.
    Bloody hot summers in Katy, TX; the rest of the year is just plain hot!

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    Mod Squad Bama Rambler's Avatar
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    Re: Safe to Swim in High Chlorine levels

    You know you're done shocking when:
    1. You lose 1ppm FC or less overnight.
    2. You have .5ppm CC's or less.
    3. Your water is clear if you don't have a FAS-DPD test kit.

    It's safe to swim up to shock level for your CYA.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Safe to Swim in High Chlorine levels

    Thanks for the quick response!!! I have two eager little boys and I didn't want them to come out with bleached hair , they have green light to swim now!
    I will monitor my FC with the FT100 test kit and hope to be done with the algae at once! I forgot to add that my CC was 0.
    Built in 2014, 18,000gal, plaster, in ground, Pentair Clean & Clear Plus 2.0 HP, Booster Pump, Cartridge filters, inline chlorinator, automatic cleaner, Pentair MasterTemp 400 heater, Silencer for SPA.
    Bloody hot summers in Katy, TX; the rest of the year is just plain hot!

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    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
    Posts
    12,082

    Re: Safe to Swim in High Chlorine levels

    The 24 ppm with 40 ppm CYA at your pH is roughly equivalent to a pool with 1.5 ppm FC and no CYA so similar to many indoor pools. Nevertheless, the high FC level means you don't want to be drinking lots of pool water so if your kids are real gulpers/drinkers then consider keeping them out. Getting a little water sipped in is no problem -- I'm talking about serious drinking which I presume is unlikely. This exposure is also presumed to be short-term since at some point hopefully soon your shocking will be over.

    The EPA limit of 4 ppm FC assumes drinking around 2 quarts of water every day so at 24 ppm this would be equivalent to 1-1/3 cups of your current pool water every day for months. CYA essentially doesn't absorb through the skin so it is unlikely that the chlorine bound to the CYA (which is 93% of the FC) does either.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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