Usually the color changes at about 3 1/2 drops.Sometimes 4 or 5 drops.It says multiply by 10 to determine Carbonate hardness =say 40mg/l.Now I want to get the number to use with the ph-kh chart to get my co2 ppm.I always use the conversion chart with the test kit for dh degrees and multiply by .056 and will get 2.24 kh.There is also conversions for Clark h degrees,fh degrees and hardness degrees.Is 2.24 the correct number to correspond to the ph-gh co2 chart?
