hoppycalif

There have been several discussions about the inaccuracy of CO2 measurement using KH and PH. It was suggested that we take a tank sample and let it sit overnight to reach equilibrium with the CO2 in the atmosphere. That was assumed to be about 3 ppm. If the PH increased by about 1.0 the CO2 was assumed to be about 30 ppm. This led me to look at the CO2/PH/KH equation some more and reduce it to a difference between equilibrium PH and tank PH, to give the attached chart. Any comments? If this is mathematically correct, it looks like a more accurate way to measure CO2, without worrying about what the KH is.




Edit: My experimentation indicates that the equilibrium ppm for my kitchen is about 4 ppm. This chart has been revised to reflect that.