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Re: dupla CO2 tester

> Date: Mon, 27 Oct 1997 18:58:01 +0100
> From: "Simone e Pierluigi Vicini" <psvicini at mdnet_it>
> I have one doubt regarding my Dupla CO2 tester.  I've been injecting
> CO2 for three days but the color of the tester says that no CO2 is
> present in the water. My water has an hardness of 170-200 p.p.m. and a
> temp of 27 C, no surface movement. I'm injecting a good amount of CO2,
> and I'd like to know if it's normal at this hardness that my tester
> does not work I don't want to kill my fish with 100 p.p.m. or more of
> CO2.

Is this the Dupla "Continuous Test" or test kit?  From your question,
it sounds like the in-tank Continuous Test.  This is supposedly
sensitive to carbonate hardness (KH) and uses a reagent to indicate
the relative CO2 content.  One of three things may be wrong: 

1) not much CO2 is getting into your water; what is your CO2 source
and what kind of reasctor do you have? 

2) your KH is wrong; what kind of hardness are you measuring at
170-220 ppm (KH [HCO3] or GH [Ca and Mg] or something else)?  What
kind of test kit?

3) the reagent in the test may be too old. 

Have you measured pH?  If CO2 is being dissolved, you should see the
pH value decrease.

Need Info?  http://www.frii.com/~booth/AquaticConcepts.htm
     * Last updates 10/21/97