I still don't understand how it works. I use it on a 40 gallon aquarium. It is located on the opposite side of the CO2 atomizer. First I set the CO2 to 1 bubble per second but to no avail. Then it was increased to 2, 3 and 4 bubbles per second and left overnight, but still no color change was observed, indicating the amount of CO2 in the water.
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