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Re: CO2, KH..



> From: "wayne jones" <waj at mnsi_net>
> Subject: KH, CO2 ...yet again 
> 
> > No, it means that the "addition of
> CO2" resulted in the CO2
> >concentration increasing by a factor of
> 10^0.4 from what it was before.
> >That is, a factor of about 2.5.
> 
> Sorry to bother you again but, I thought
> that the CO2 concentrations in the tank
> without CO2 injection were always in
> equilibrium with atmosphere namely about
> 3 ppm.

	As I recall, water at about 25C, in equilibrium with the atmosphere,
would contain about 0.5 - 1 ppm CO2.

> I suppose the fish add a certain
> amount of CO2 but I do not think it
> would be any more than the plants
> consume. Certainly the pH of my tank
> water is not appreciably different than
> my tap water.

	Sometimes tap water has more CO2 than would be in equilibrium with the
atmosphere.

> If this is so does this
> mean that in most tanks a pH drop of .4
> will produce a CO2 concentration of
> about 8 ppm.

	I would suspect that it would be lower than that.  Just use the
pH and KH to get the result from the table (or the equations in the archives).


-- 
Paul Sears        Ottawa, Canada