Re: KH,pH,CO2 table

• To: <Aquatic-Plants at actwin_com>
• Subject: Re: KH,pH,CO2 table
• From: "Loh Soon Hin" <lsh9933 at singnet_com.sg>
• Date: Fri, 20 Dec 1996 12:07:17 +0800

> From: "Matthew Paul Rhoten" <mrhoten at surly_org>
> Date: Wed, 18 Dec 1996 18:55:55 -0800
> Subject: re: KH, pH, CO2 table ...
> 
> > pH as a function of CO2 concentration and KH value:
> >  7.58+@LOG(KH)-@LOG(CO2)
> > 
> > CO2 concentraction at a given pH and KH	
> >  10^(7.58-pH+@LOG(KH))

What is the standard unit for KH?

 A note under the Optimum CO2 Content Table in Dupla brochure says :
  '' carbonate hardness in German degrees ( 1 degree dKH~ 10 ppm)''

However I had read from other references that say 1 German Degree equals
17.9 ppm .

Which is which?

TIA

Loh SH

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