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Re: softened water
>
> Date: Wed, 24 Sep 1997 10:54:31 -0400
> From: rjw at aluxs_micro.lucent.com (Ronald Wozniak)
> Subject: Re: Softened Water
>
[lots of review and background snipped]
>
> 1 degree GH = 17.9 ppm Ca = 2 x 23/40 x 17.9 = 20.6 ppm Na
>
A (German) degree of hardness is 17.9 ppm hardness as _CaCO3_, which
isn't the same thing as 17.9 ppm of Ca. There are 40 parts of Ca for
each 100 parts of CaCO3, so:
1 degree GH = 17.9 ppm hardness as CaCO3
17.9 (ppm CaCO3) X 40(Ca)/100(CaCO3) = 7.16 ppm Ca
Now going back through the rest of your calc:
7.16 ppm Ca => 2 X 23/40 * 7.16 = 8.23 ppm Na.
or softening 1 degree GH produces 8.2 ppm of sodium - the same number I
cited earlier.
Roger Miller