ISTA – CO2 INDICATOR

CO₂ Drop Checkers are used for long-term monitoring of the CO₂ levels in the aquarium. A CO₂ reagent is filled into those CO₂ Drop Checkers and will change the color according to the amount of dissolved CO₂ in the aquarium water. Green will indicate a proper CO₂ value, yellow will indicate to much CO₂ and blue will show not enough CO₂.

The indicator solution turns green at approx. 20-25 mg/l of CO₂.