Re: NANFA-- TDS and Conductivity

Bruce Stallsmith (
Tue, 24 Oct 2000 18:16:02 EDT

OK, so those meters are lowballing the actual TDS in most natural waters. I
became an adherent to the 60% of conductivity as ppm of TDS based on the
research of a Swedish geochemist in the 1940s & 1950s, a man by the name of
Karl Rohde (no relation to Fritz that I know of...). But in truth this is
not a magic number.

--Bruce Stallsmith

>Subject: Re: NANFA-- TDS and Conductivity
>Date: Tue, 24 Oct 2000 17:41:58 EDT
>In a message dated 10/19/00 10:58:36 AM, writes:
><< I'm
>honestly not sure exactly what calculation the Hanna meter makes. >>
>The Hanna meters are based on a calibration using potassium chloride which
>exactly 50% or 2X relationship. Most natural waters are about 55% or 1.8X
>because there are different ions present.
>Lee Harper

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