To be used with any CO2 drop checker. The solution changes color to provide a quick and accurate indication of CO2 levels in an aquarium. This version is a concentrated solution that should be mixed with water from the aquarium to be monitored. Typically 2-4 drops per drop checker filling.
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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