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Re: CO2 causing a rise in KH

> From: "Philippe Lemaire" <ph.lemaire at CompaqNet_be>
> Subject: Re: CO2 causing a rise in KH
> IMHO adding CO2 can prevent KH of going down...
> I mean some plants can take carbon from carbonates when necessary and make the KH lower.

	That occurs when you have high KH and high GH.  The reaction is:

	Ca++  +  2HCO3-  ->  CaCO3(solid)  +  H2O  +  CO2

	The pH will be well over 8.  You won't get an already low KH being
reduced by this mechanism.

Paul Sears        Ottawa, Canada