Reading about ORP on another thread brought up some of my own questions. First, what is the ideal ORP range for swimming pools? The WHO says that 650mV is suitable for drinking water, than why have I seen pools with ORP setpoints at around 525mV? ANd how would you decide what the ORP setpoint should be?
THe higher the pH, the lower the ORP because ORP meauseres the quality, not quantity of sanitizer. So if the ORP was, for example, 750mV, and the Free Chlorine reading was 5.0, why does it take so long for the ORP probe to realize that the Free Chlorine level has been met?
If ORP is not trustworthy, than why are there no chemical controllers that can measure in ppm rather than ORP?
Thank you, for helping me to better understand ORP.