Quote:
Originally Posted by Gomer  This doesn't matter one bit. The indicator is disolved in DI/RO/Nanopure water. The GH and KH is zero. Since the color change is purely a gas phase equilibrium, what you see is what you get. Bromothymol blue is blue at pH 7.6 and yellow at pH 6. |
So, this test takes the tank water out of the equation? Does this mean it assumes that the CO2 in the tank water and in the indicator device is the same in ppm, by having the CO2 being measured come from the tank water? I'm not a chemist, so I don't know much about this - does this truly remove the variables in our tank water from the picture? If so, I will certainly buy one of these. My eyes work pretty well for judging yellow-green-blue, so it would work pretty well for me.
Now, what ppm of CO2 does ADG consider to be ideal? And, is the color change sensitive enough to judge "ideal" + 10 ppm as bein different from "ideal" minus 10 ppm? Since these seem to still be out of stock we have time to explore these questions before sinking the $38 + shipping in one.