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Thread: "Dangerous" levels of chlorine

  1. Back To Top    #1

    Join Date
    May 2008

    "Dangerous" levels of chlorine

    I just used Trichlor pucks for a week while I was gone on vacation, and in reading the side of the "jug" they came in, it said to "never enter a pool with a chlorine level higher than 3 ppm". I keep my ppm higher than 5 most of the time (here in AZ we run our CYA a bit high because of all the sun).

    Any guesses as to why it says this on the trichlor label? I thought maybe it was for pools without CYA, but it actually says to adjust the CYA to an appropriate level further on in the instructions.
    Good Times

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: "Dangerous" levels of chlorine

    That is a very old rule from before CYA. It is still appropriate if you don't have any CYA in your pool. Since you are using CYA, just ignore it.
    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

  3. Back To Top    #3

    Join Date
    Mar 2007
    Coastalish 'down easter'

    Re: "Dangerous" levels of chlorine

    They say it to avoid lawsuits

    Because our lawmakers know less about pool's than a braindamaged monkey, they rely on industry professionals to tell them what the requirements should be - unfortunately, the professionals don't really know 'Jack' about most things either - the end result is that there are 'rules' that haven't been scientifically tested/ studied which are made into law Fortunately there are 2 sites I can name that cut through the industry BS and try to find the 'truth' so that pool owners can have a Trouble Free Pool (You're logged on to one of them now)

    The 'don't enter pool water with 3+ cl' is old school advice - chem geek has a few posts on the fallacy of this when the cya level is taken into account - (it's probably wrong with no cya anyway). The other issue is whether it's tc>3 or fc> 3> I've somewhat of a 'grasp' on the concepts involved here, but not enough to fully explain
    Luv& Luk

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

    POOL SCHOOL, TF Testkits, Jason's Pool Calculator, CYA vs. cl chart, (Just a few DARNED handy links!)

  4. Back To Top    #4

    Join Date
    Feb 2008
    Flower Mound, TX

    Re: "Dangerous" levels of chlorine

    The toxicity of chlorine is more related to its effects when it is inhaled than anything else. It is a strong oxidizer in its pure state and a strong asphyxiant (it displaces oxygen causing suffocation via respiratory arrest). Wikipedia mentions that the gas can cause symptoms of toxicity in levels of 30 ppm or higher but this is the gas and not the chlorine that is dissolved in water. It is probably safe to say that swimming in pool water with chlorine levels much higher than 3 ppm would be safe. Skin is an intact surface and I would think that it would be unlikely that we would accumulate chlorine by absorption through the skin. Your lungs will tell you whether or not it is safe. That's my best guess anyway.

    Hope this helps.

    10K gallon IG gunite with waterfall; Pentair CC320P filter; WhisperFlo 2 HP pump
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    "It depends."- JohnT

  5. Back To Top    #5
    frustratedpoolmom's Avatar
    Join Date
    May 2007
    SWSuburban Chicago, IL

    Re: "Dangerous" levels of chlorine

    I remember the first time my froggy malfunctioned, dumping the entire bac pac of tri-chlor into my pool in 48 hours, instead of lasting the normal 3-4 weeks. My chlorine was off the chart, at least a 10. I freaked! I was dumping water, replacing with fresh, couldn't get it to drop for 2 days. Hot weather was forcasted....we wanted to swim! So I went the the pool store to ask the "expert" there what I could do to lower the chlorine, I was desperate!.....he's like, "oh, you can swim in that"..."but, but, everything says ONLY swim if FC is 1-3 ppm!" "Nah, he's fine. Just take a shower. Wear an old suit."

    Gosh, I look back to my pool experiences pre-TFP and I just shake my head at the patheticness of it all... .
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner

  6. Back To Top    #6

    Re: "Dangerous" levels of chlorine

    As far as it goes the State of Florida (and many other State Health Departments also) will allow a commercial pool or spa to open once the FC drops below 10 ppm after shocking and that is also reflected in the newer CPO handbooks. Arch chemical now says to keep FC levels between 1-4 ppm on their products (HTH and Poollife) and wait for shock levels to drop below 10 ppm before entering the water.

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