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Thread: Total Chlorine vs Free Chlorine

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    Total Chlorine vs Free Chlorine

    I have the TFT100.

    The basic OTO test (aka Taylor K-1000) says it tests for Total Chlorine.

    Then there is the Chlorine Drop Test which will tell you Free Chlorine (FC).

    Are these terms synonymous? Is FC the same as TC? If not what is the relationship between the two?

    The CYA chart indicates what your FC should be based on CYA. So it seems the important test is the FC.


    What is the purpose of taking the TC readings?



    Thanks
    -Shotcrete Pool. Pebble Sheen. Tile by Dal Tile CW27 Winter Blues. Pool dimensions 45x19 24,360 gallons. Spa dimensions 7x7 825 gallons. -Hayward Equipment: OmniLogic, Main filter pump Ecostar SP3400VSP, Spa pump Ecostar SP3400VSP, Filter 700sq ft Cartridge Filter HCF7030C, T-Cell 15 SWG, GVA 24 valve actuators, Universal ColorLogic 12v LED lights, H500FDN Natural Gas 500,000 BTU heater, TF100 test kit.

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    Patrick_B's Avatar
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    Re: Total Chlorine vs Free Chlorine

    Actually you test FC and CC then add the two for the TC result. You don't want much CC and less than 1.0 CC is ideal.
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    Re: Total Chlorine vs Free Chlorine

    Quote Originally Posted by Patrick_B View Post
    Actually you test FC and CC then add the two for the TC result. You don't want much CC and less than 1.0 CC is ideal.
    So the TC you get by combining the FC and CC should theoretically match up with the results you see using the K-1000 test?
    -Shotcrete Pool. Pebble Sheen. Tile by Dal Tile CW27 Winter Blues. Pool dimensions 45x19 24,360 gallons. Spa dimensions 7x7 825 gallons. -Hayward Equipment: OmniLogic, Main filter pump Ecostar SP3400VSP, Spa pump Ecostar SP3400VSP, Filter 700sq ft Cartridge Filter HCF7030C, T-Cell 15 SWG, GVA 24 valve actuators, Universal ColorLogic 12v LED lights, H500FDN Natural Gas 500,000 BTU heater, TF100 test kit.

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    Patrick_B's Avatar
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    Re: Total Chlorine vs Free Chlorine

    Yes, that's how you figure TC. The tests will be close, but the drop count test is much more accurate, and if you'll notice, the OTO (yellow) test has ranges. If you want a concrete and accurate reading the drop count is best.
    TFP Moderator
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