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Thread: ORP vs ppm

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    ORP vs ppm

    Am interested in the correlation between ORP and ppm free Cl2, and relationships with pH and CYA. Are there any charts available?

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    Patrick_B's Avatar
    Join Date
    Jun 2011
    Midland TX

    Re: ORP vs ppm

    Welcome to the forum Jim!
    We have a couple of Chlorine/Cya charts here actually. If you check out the links in my sig, you will find them in Pool School.

    As for a FC chart correlating with ORP, it is only possible in theory. Rarely if ever will mV to FC be accurate in practice because ORP readings are greatly influenced by many factors...pH being only one. Even in systems where conditions are "perfect", accurate control of FC via ORP is not easy to nail down.
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    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: ORP vs ppm

    See this post and the rest of the discussion in that thread.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
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