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Thread: Confused by free/ combined chlorine

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    Join Date
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    Confused by free/ combined chlorine

    I'm a new pool owner and am using the taylor2006 test kit. My numbers are: free chlorine 3.2ppm, combined chlorine 0.2, 7.4 alkalinity 90ppm cya40ppm.
    I'm clueless as to what the chlorine level should be but thought the free should be 0 not combined. Could someone please let me know. Thank you!
    Above ground vinyl liner,18x54 , 1.5hp jacuzzi brand sand filter/pump. Not sure on gallons (7600?) Built new June 2016. Taylor 2006 test kit.

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    bmoreswim's Avatar
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    Re: Confused by free/ combined chlorine

    Welcome to TFP! Glad you found us.

    You should give the following link a thorough reading. It will help you to understand that your FC level needed varies based on your CYA level.

    abc-of-pool-water-chemistry

    There is a link to an FC / CYA chart on that page which is a cornerstone concept.

    Please ask questions after reading through the information.
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    Texas Splash's Avatar
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    Re: Confused by free/ combined chlorine

    Also, judging by your FC results, you're using the Taylor 25ml sample size right? Instead, try the 10 ml sample:
    10ml water sample, one heaping scoop of powder, multiply drop count by 0.5 (basically divide by 2)
    Example: Total # of drops until clear was 12 = FC of 6. Should save you on some reagents.
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    Re: Confused by free/ combined chlorine

    Thanks very much for that tip! So thankful for this site going to read some ��
    Above ground vinyl liner,18x54 , 1.5hp jacuzzi brand sand filter/pump. Not sure on gallons (7600?) Built new June 2016. Taylor 2006 test kit.

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    Re: Confused by free/ combined chlorine

    Let us know if you need any more clarification!

    Just in case you missed the link in the reading above, here it is straight out:
    Pool School - Chlorine / CYA Chart

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