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Thread: Quick question on Chlorine levels

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    Suarez7's Avatar
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    May 2011
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    Quick question on Chlorine levels

    Hello.

    Just had a quick question regarding chlorine levels. I used a test kit to see my CYA is around 40-50, which gives me a minimum chlorine level of 4 ppm with a target of 6 ppm.

    I could swear that I've read somewhere (might've been on the leslie's test kit) that you shouldn't enter the pool if chlorine is above 5. I am fully aware that pool stores sell more BS than quality products but am just wondering how CYA affects how chlorine is good/bad for a human body. Is there any truth to Chlorine levels above 5 being bad and does CYA actual change that?

    Thanks in advance.
    -AG round Vinyl, roughly 27'x4.5' = 18,000 gallons
    -Hayward S180T Sand Filter
    -1.5 HP pump
    -1 skimmer and 1 drain in bottom center feeding pump/filter to one return

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    Mod Squad woodyp's Avatar
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    Re: Quick question on Chlorine levels

    You can safely swim up to shock level value for your CYA level.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
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    Mod Squad jblizzle's Avatar
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    Re: Quick question on Chlorine levels

    That would only be true with 0 CYA ... which is all the pool stores seems to assume everyone has.

    You are perfectly safe to swim in a pool with CYA in all the way up to shock level ... as the active chlorine is still less than you would find in a public pool that has 0 CYA and 2ppm of FC.

    See this:
    http://richardfalk.home.comcast.net/~ri ... l/HOCl.htm
    Jason, TFP Moderator
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    BoDarville's Avatar
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    Re: Quick question on Chlorine levels

    Suarez7:

    You are fine to enter your pool at an FC of 5. A certain amount of chlorine is bound to CYA. Basically, this means that an FC of 5 @ a CYA of 40 is equivalent to an FC of 9 @ a CYA of 80 (see Chlorine/CYA Chart link in my sig). So, it is safe to swim at an FC level that is below shock level for your CYA.
    Gold Supporter, TFP Lifetime Supporter, 26,680 gal Plaster IGP 3.5 - 10' depth / Attached Waterfall Spa, Manually Chlorinated, Triton Sand Filter, 1.5 HP * 1.1 SF = 1.65 SFHP 1-speed Pentair WhisperFlo WF-26 Pump, 400K BTU NG Teledyne Laars Series One Heater, Polaris 360, Test Kit Comparison, Chlorine/CYA Chart, SLAMing Your Pool, OCLT
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    Suarez7's Avatar
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    Re: Quick question on Chlorine levels

    Thank you all so very much. That erases my fears completely and I'm excited to enter the BBB method in full!
    -AG round Vinyl, roughly 27'x4.5' = 18,000 gallons
    -Hayward S180T Sand Filter
    -1.5 HP pump
    -1 skimmer and 1 drain in bottom center feeding pump/filter to one return

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    alanpaul's Avatar
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    Re: Quick question on Chlorine levels

    Yes, yes! Thank you for that clear and clean explanation. It will help a lot of us in our maintenance.
    Alan in Wellington, FL - near West Palm Beach
    15,200 gal IG, painted plaster, 1988; 200 SqFt cartridge filter, 2013; 1.5 HP 1-speed pump (uprated), 2005; heat pump, 2005;
    soon to repair (dead) SWG AquaRite T-15 cell, 2005, and replace (dead) suction-side cleaner, 2005.
    Almost everything died this winter 2012-'13, and I know we shouldn't complain... but, Arrgh!

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