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Drop checker from ADA is an accessory specially designed to examine the CO2 levels in an aquarium in a few simple steps. Fill the drop tester with pH reagent and aquarium water. Then put it in the aquarium. The color indicates the CO2 content .
If the reagent is yellow from the start due to low pH value in the aquarium, adding CO2 will not change the color of the reagent. In this case, before reinstalling the drop checker in the aquarium, change the water to raise the pH and make sure the reagent turns blue or green.
Drop checker from ADA is an accessory specially designed to examine the CO2 levels in an aquarium in a few simple steps. Fill the drop tester with pH reagent and aquarium water. Then put it in the aquarium. The color indicates the CO2 content .