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RE: pH/KH/CO2 formula

Thank you for posting that chart. I had not seen it. Based on my bioplast
CO2 test kit I have been measuring CO2 at 8 to 16 PPM. My KH is 8.4 and my
PH is about 6.6. According to this chart my CO2 would be in the 80 PPM
range. Since I do not add anything other than some crushed coral am I to
assume that my test kit is wrong? I know that my kh is way high. My tap
water is 6.7 kh and I had added the crushed coral as I said.

Any suggestions?