To be used with CO2 drop checker. The solution changes color to provide a quick and accurate indication of CO2 levels in an aquarium. Colour guide is calibrated to 4 dKH. Recommended to be changed once a month or when the color fades.
12 ml bottle Yellow: high CO2 (danger to fish)
Blue: low CO2
Green: balanced - enough CO2 for plants, not too much to suffocate fish
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