CO2 levels and KH

["wayne jones" <waj at mnsi_net>]

 >>I thought it was settled that kH has
 >>nothing to do with pH variation due
to
 >>CO2 injection. I take this to mean
that
 >>if an airstone drives off most of the
 >>CO2 and the pH does not move very
much
 >>then you did not have much CO2 in the
 >>first place. I am not saying your
 >>observations are incorrect just that
 >>they appear to contradict my
 >>understanding of the theory.

>I'm still confused about this. See for
instance this article at the Krib:

me too

>Here's an excerpt (from the Krib)

>The higher the amount of
carbonates/bicarbonates in the aquarium,
the
>more CO2 is needed
> to maintain a specific pH.

I think this statement is correct.

>Here's a question: Does it require more
CO2 to change the pH, say, from 8.0
>to 7.0, than it does from 7.0 to 6.0?
Would that explain my pH's seeming
>reluctance to change at pH 7.8 and 7
dKH?

I think the answer is yes if the if the
starting concentration of CO2 is higher
in the second case, no if the starting
concentration of CO2 is the same in both
cases.

>The other question is, where is my CO2
going? I have one bubble per second
>coming through an Eheim diffuser, which
in turn is right below my Fluval
>intake. As far as I can see *every*
bubble is being dissolved. This should
>really be more than enough CO2 for a 29
gal tank, right?
>But my pH only changes from
approximately 7.8 to 7.6. By the chart,
that
>gives me between 4-6 ppm CO2. Shouldn't
I have more than that? There is
>little to no surface agitation.

Now you are getting to the part that
confuses me too. Hopefully someone else
can help. I agree that it appears that
more CO2 is required to increase the CO2
concentration when the kH is high.

Wayne Jones

Wayne's DIY Aquarium Setup at
 http://www.mnsi.net/~waj

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