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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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