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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

> 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