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CO2 test kit and pH

Several people responded to my pH/CO2 problem. The overwhelming response was 
that my CO2 test kit was wrong. So I tested it by taking some of my "70 ppm" 
water and aerating it for about an hour with an air stone. The results: the 
aerated water measured out at 40 ppm CO2. So I'm chucking my Red Sea CO2 kit 
and just going back to using the chart. Thanks for all the input.