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CO2 and pH situation

> BeetleMaster at aol_com wrote:
> I just got a CO2 test kit and it shows that my water has 70 ppm CO2,
> right 70. Now I'm trying to use the CO2/carbonate buffering system, but
> at 70ppm, my pH is only 6.8. My KH is 3 and my GH is 5. According to the 
> charts, with a Ph of 6.8 and KH of 3, my CO2 should be 20 ppm, but it's

I'd immediately suspect the new test kit!  
michael rubin
michael at rubinworld_com