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Thread: combined total free chlorine

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    Join Date
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    combined total free chlorine

    I am a little confused over Total Chlorine, Combined Chlorine and Free Chlorine

    The HTH 3 way test kit to my knowledge, measures Total Chlorine

    My test strips measure only Free Chlorine
    I currently have no way of measuring Combined Chlorine.

    It is my understanding that Combined Chlorine = Total Chlorine Free Chlorine

    So if I have free Chlorine at 2ppm
    and Total Chlorine at 5ppm
    I have combined chlorine of 3ppm and I need to shock the pool ? Even though it looks great, sparkling and clear ?


    No I dont have a Taylor test kit, im In Ontario Canada and they are next to impossible to obtain.
    2012 new 15' x 52" round sharkline above ground, DIY installed & BBB maintained. 3/4hp with 19" 150lb sand filter, 4 x 20 sungrabber solar heater. DIY solid piped.

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    JasonLion's Avatar
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    Re: combined total free chlorine

    You have the right idea. However, if you are getting FC and TC from two different test kits, the errors in their readings won't be correlated, so the potential error in the CC result will be much larger than it would be if you got both numbers from the same test kit. To put that another way, chances are than one or the other test result is wrong, and thus you can't trust the CC result you get that way.
    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

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    Re: combined total free chlorine

    Are you sure you can't find the K2006 in Canada?

    TC=FC+CC

    Perform the overnight chlorine loss test and you'll know if you have a problem.
    pool-school/overnight_fc_test
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
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    Mod Squad jblizzle's Avatar
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    Re: combined total free chlorine

    This is where I have heard the neighbors to the North have to go:
    http://piscines-apollo.com/cubecart/tes ... -2006.html

    Of course they are out of stock
    Jason, TFP Moderator
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  5. Back To Top    #5

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    Re: combined total free chlorine

    Did not use the pool yesterday and neglected to check it.......
    This morning, Total Chlorine and free chlorine are both at zero. Which in effect is a good thing i guess.....
    Added 42oz of walmart bleach to bring it up to 4-5
    Looks sparkling crystal clear
    How long before water goes bad if FC left at zero ? im guessing a few days at least, and less as the temps go up ?
    2012 new 15' x 52" round sharkline above ground, DIY installed & BBB maintained. 3/4hp with 19" 150lb sand filter, 4 x 20 sungrabber solar heater. DIY solid piped.

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    Mod Squad jblizzle's Avatar
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    Re: combined total free chlorine

    Algae will start to grow any time the FC is lower than the minimum for your CYA level as shown in the CYA/FC chart in Pool School. What is your CYA level?

    One of the recommended test kits would be a very good investment for you. As right now it seems like you only test for a couple of the chemicals.

    Posted with Tapatalk ... sorry if I sound short ... hate typing on phone
    Jason, TFP Moderator
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    frogabog's Avatar
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    Re: combined total free chlorine

    My pool went bad last season after being below minimum for maybe 6 hours. It can happen fast.

    I caught it early, and all was well 12 hours later. But I also have a test kit that tells me if something's wonky. I know it's hard to find the right kit, but it really is worth some further effort to get one.
    Where kids swim in 54 degree water, turn blue, and giggle happily cuz they got a POOL!
    Year 3 BBB -15' x 48" Intex Metal Frame - Was using (2) 1000gph Intex cartridge filters (see Full time pumping Intex). 2012, converted to 1600gph and sand filter+SWG = Sand filter love affair!
    Don't waste time and energy looking for a better value on test kits, the TF100 is the best deal around. I did the looking and spent the extra money, but you don't have to make the same mistake. Just go here: TFTestkits. I use Pool Calculator for min/max, and shocking chlorine levels.

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