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Jerome from Buenos Aires wrote:

About the Amano's book.. The values of KH/PH/CO2 published are not = to
the charts that you sent to me last days..(the CO2 ph KH charts..)

The Amano numbers aren't quite right.  George commented a few months ago
that fairly small measurement errors could account for the
descrepencies.  The two dozen entries I checked weren't horribly off,
just slightly off.  

Regards, Steve Dixon