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Re: [APD] CO2 measurement
>Date: Thu, 02 Mar 2006 17:49:04 -0600
>From: Barry Anderberg apd at swoobs_org
>My city water report says KH is due only to bicarbonate, and that the KH
>is 18. AP test kit confirms this value.
Are you, by any chance, confusing KH in mg/L (i.e. ppm) with KH in degrees?
I ask because my water department reports KH in mg/L.
If your reading of 18 is actually in mg/L or ppm, then the KH in degrees is
only about 1. The formula and table use KH in degrees. If that is the
case, at a pH of 6.8, your CO2 would be only 2.4 ppm.
John T. Fitch
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