Pool ORP to PPM Free Chlorine Convertion Sensor

4

I came across this when I was using my old floating pool monitor (it didn’t last long).

  - platform: template
    sensors:
      pool_free_chlorine:
        value_template: "{{ ( 0.23 * (1 + 0 / 100 ) * ( 14 - states('sensor.pool_monitor_ph')|float(0.0)) ** ( 1 / (400 - states('sensor.pool_monitor_oxidation_reduction_potential')|float(0.0) - 516)/145) + 10.0 ** ( (states('sensor.pool_monitor_oxidation_reduction_potential')|float(0.0) + states('sensor.pool_monitor_ph')|float(0.0) * 70 -1282) / 40 ) ) |round(1) }}"
        unit_of_measurement: ppm
        icon_template: mdi:react
        friendly_name: "Calculated Free Chlorine"

I’ve added it to my setup but it seems a bit off especially as the temperature of the pool changes. I guess this is what you’re saying.

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