Re: [APD] Re: Aquatic-Plants Digest, Vol 14, Issue 2

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

--- Michi Henning <michi at zeroc_com> wrote:

I was thinking of the test kits you can by where you
titrate a solution, counting the drops, and watch for a
color change.

These are affected by a number of things and are based on a
pH reaction (I'm sure I'm saying this the wsrong way). But
time alone seems to goof them up. When they are brand new,
they are probably okay if there isn't much affecting your
pH beside CO2.

sh
> Out of interest, what's unreliable about the CO2 tests?
> I take it that you mean the permanent indicator tests
> that
> stay in the tank and change blue-green-yellow with
> increasing CO2? I wasn't aware that these are unreliable.
> In what way? Do they read low, or high (or sideways ;-) ?
> 
> Cheers,
> 
> Michi.
> 
> --
> Michi Henning              Ph: +61 4 1118-2700
> ZeroC, Inc.                http://www.zeroc.com
> 
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