#### MrClockOff

##### Member

@Yugang could you please elaborate with more details on the formula CO2 = 12.839 * dKH * 10^(6.37 - pH) please?The formula that I use is CO2 = 12.839 * dKH * 10^(6.37 - pH). Indeed the relationship pH to CO2/dKH is logarithmic, not linear. It is important to understand that also outgassed pH is not a constant, but dependant on KH and ambient air CO2 concentration.

Most importantly,a given pH drop (from degassed) will indicate an X% CO2 increase, irrespective of KH. (pH drops 1.0, means 10 fold CO2 compared to starting CO2, from the above formula). This is also true for KH below 1, from all references that I've seen.

Please correct me if I'm wrong

CO2 - achieved ppm concentration

**12.839 - what is this? Initial ppm of CO2 in the water**

dKH - carbonate hardness in degrees

**10^ what is this?**

6.37 - degassed water PH

pH - current PH

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