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Thread: Chlorine test

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    Chlorine test

    I have a Taylor K2006 and K1000. The 1000 only tests for total chlorine. All I ever read on here is people talking about FC. When do I need to check for TC? What is the difference in the two?


    25x16 rectangular in ground pool with vinyl liner (14,000 gal). Sta-Rite sand filter. 1HP single speed Max-E-Pro pump. Pool owner since 2013.

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    Mod Squad JVTrain's Avatar
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    Re: Chlorine test

    The FAS-DPD test uses the DPD powder and scoop to test for FC. This is a titration test where you add the powder to get a pink/red color and add R-0871 drops until it turns clear. This first number gives you the free chlorine (FC) level. You add the R-0003 reagent to turn the solution back to pink (if there is any CC) and then drop wise add R-0871 again until it's clear. The second titration give you the combined chlorine (CC).

    The K-1000 test only gives you the total chlorine (TC) which is the sum of FC and CC.

    FC + CC = TC
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    Re: Chlorine test

    So if I am getting no reading on the 1000 test then I have no FC or CC.


    25x16 rectangular in ground pool with vinyl liner (14,000 gal). Sta-Rite sand filter. 1HP single speed Max-E-Pro pump. Pool owner since 2013.

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    Mod Squad JVTrain's Avatar
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    Re: Chlorine test

    Quote Originally Posted by Nate1975 View Post
    So if I am getting no reading on the 1000 test then I have no FC or CC.


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    Exactly! Time to get some bleach in the pool!
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
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    Re: Chlorine test

    Tested CYA and got a reading between 60-70...so I rounded to 70. Pool math said I would need just over 1 jug of bleach to get to FC 7. I went ahead and added 2 full jugs as we had lots of kids swimming today. I went out 45 min after adding bleach and am getting a reading of only 2 FC and 3.5 CC. Water is clear just not holding chlorine. Is my CYA the problem or?? Not sure what to make of that.


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    25x16 rectangular in ground pool with vinyl liner (14,000 gal). Sta-Rite sand filter. 1HP single speed Max-E-Pro pump. Pool owner since 2013.

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    Mod Squad jblizzle's Avatar
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    Re: Chlorine test

    When did you add CYA to the pool? Was it zero?

    Having a CC that high is unusual and not good. So, you need to follow the ShockLevelAndMAINTAIN Process. Try to test every 30-60 minutes to start until the FC starts to hold.
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    Re: Chlorine test

    I am transitioning from tri chlor and di chlor to bleach. Should I drain some water to start the process with a good cya level?


    25x16 rectangular in ground pool with vinyl liner (14,000 gal). Sta-Rite sand filter. 1HP single speed Max-E-Pro pump. Pool owner since 2013.

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    Mod Squad jblizzle's Avatar
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    Re: Chlorine test

    It would not hurt to replace half the water ... still will need to SLAM though.
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    Re: Chlorine test

    When draining...do I just drain a little then keep testing until my cya is in the normal range? Then refill and begin SLAM?


    25x16 rectangular in ground pool with vinyl liner (14,000 gal). Sta-Rite sand filter. 1HP single speed Max-E-Pro pump. Pool owner since 2013.

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    Re: Chlorine test

    No. Your CYA will drop by the same % as the amount of water you drain.
    If you drain 50% and then test that water, the CYA will still be what you started with. Then you refill and it dilutes it to be 50% of what you started with.

    Your CYA is really not that high and perfectly manageable.
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    Re: Chlorine test

    So if I don't drain it will just take more bleach to reach the target levels? I am curious why the amount of bleach pool math figured didn't raise the FC to the level it calculated? I tested my cya twice and it was in between 60-70 both times. Any other reasons?


    25x16 rectangular in ground pool with vinyl liner (14,000 gal). Sta-Rite sand filter. 1HP single speed Max-E-Pro pump. Pool owner since 2013.

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    Re: Chlorine test

    Because something is in your water consuming the FC as fast as you add it ... thus the high CC level.
    I suspect it could be an ammonia issue which is why I asked if you had recently added all that CYA.
    But, I am not sure ... end result is you need to keep adding bleach until the CC drops and the FC holds and then follow the SLAM process.
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    Re: Chlorine test

    Quote Originally Posted by Nate1975 View Post
    Tested CYA and got a reading between 60-70...so I rounded to 70. Pool math said I would need just over 1 jug of bleach to get to FC 7. I went ahead and added 2 full jugs as we had lots of kids swimming today. I went out 45 min after adding bleach and am getting a reading of only 2 FC and 3.5 CC. Water is clear just not holding chlorine. Is my CYA the problem or?? Not sure what to make of that.
    Just to make sure, you used a 10 ml sample size and it took 4 drops of FAS R-0871 drops during the first part of the test for FC and then after adding 5 drops of R-0003 it took 7 drops of R-0871, is that correct? If so, then indeed the 7 ppm FC you added looks like it may have combined with some ammonia or something else fairly reactive to form the CC and deplete some of the FC beyond that possibly starting to get rid of the CC. The good news is that you had at least some FC which means it hopefully won't take a lot of chlorine to recover from this. You could SLAM to make the CC go away faster. If it's from ammonia, then 90% of it should go away in 4 hours or so, but you'll need to add more chlorine so add some more now and then see where you end up. If the CC is still there by tomorrow morning, I'd SLAM the pool.
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    Re: Chlorine test

    Yes that is correct. Is there a test for ammonia?


    25x16 rectangular in ground pool with vinyl liner (14,000 gal). Sta-Rite sand filter. 1HP single speed Max-E-Pro pump. Pool owner since 2013.

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    Re: Chlorine test

    Quote Originally Posted by Nate1975 View Post
    Yes that is correct. Is there a test for ammonia?


    Sent from my iPhone using Tapatalk
    You can pick up an ammonia test at most pet stores with fish supplies. Used to test aquarium water.

    # Sent from mobile device. Beware of brevity and spelling errors!
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
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    Re: Chlorine test

    If it's an ammonia problem, then I assume my CYA reading would be down the next time I check it? What is the solution if there is ammonia?
    25x16 rectangular in ground pool with vinyl liner (14,000 gal). Sta-Rite sand filter. 1HP single speed Max-E-Pro pump. Pool owner since 2013.

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    Re: Chlorine test

    More chlorine. Test and add every 30-60 minutes.
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    Re: Chlorine test

    Am I wanting to maintain chlorine levels at shock level or just normal FC range?
    25x16 rectangular in ground pool with vinyl liner (14,000 gal). Sta-Rite sand filter. 1HP single speed Max-E-Pro pump. Pool owner since 2013.

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    Mod Squad jblizzle's Avatar
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    Re: Chlorine test

    Shock level if you can get it that high.
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