Re: [APD] CO2 and pH control

["S. Hieber" <shieber at yahoo_com>]

That's a beaut, George. Thanks. I've read a lot of
"summaries" on this toic, but yours is the best.

sh


--- gbooth at frii_com wrote:

> > Date: Tue, 13 Dec 2005 07:54:34 -0800
> > From: Jerry Baker <jerry at bakerweb_biz>
> > Subject: Re: [APD] CO2 and pH control
> > To: aquatic plants digest <aquatic-plants at actwin_com>
> >
> > Gordon and Susan Watkins wrote:
> >> Nope, after 20+ hours it still shows 8.6
> >
> > If your pH test is correct, and there are no other
> buffers in your water
> > aside from carbonates, then your KH is around 40, not
> 9. I would be more
> > inclined to believe that there are additional buffers,
> but I'm not sure
> > what other buffers would increase the pH like that.
> 
> There are two equilibrium dissociation constants when
> carbonates are in he
> water, around pH 6.4 (bicarbonates) and around 10.2
> (carbonates). My guess
> is that Gordon's water has lots of carbonates and that
> the "normal"
> pH/KH/CO2 table does not apply.
> 
> See http://faq.thekrib.com/Annex/oldfaq-hardness.txt for
> details but don't
> ask me to explain it even though I authored it.
> 
> George B.
> 
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