KH and CO2

[Dabbler II]

Ok I have a question. How do you figure out your co2 ?
My PH is 7.6
My KH is 70 mg/l
My GH is 140
I found the charts that tell you the relation between PH and DKH. How do you convert the KH to DKH in order to calculate the CO2 in my water. I am just a little confused.

[off-ice]

1 dh=17.9 ppm (or mg/l, same thing)

So you have 3.9 dh.

According to the chart you are around 2-3 ppm CO2.