Legend CO₂ Drop Checkers are used for long-term monitoring of the CO₂ levels in the aquarium. A Legend 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.

Please note that the required CO₂ Drop Checker reagent is sold separately and does not come with this glass CO₂ Drop Checker.

1 x Legend CO₂ Checker with suction cup

Legend – CO₂ Drop Checker

Height    55 mm

Width     50 mm

The permanent test is filled with 1 – 2 ml of the Legend CO2 indicator solution and then positioned in a well-circulated area in the aquarium. After about 1 – 2 hours, the CO₂ content of the aquarium water can be read. A green colour indicates an optimal CO₂ supply of approximately  30 mg/l.

A Legend CO2 indicator solution is very useful in an aquarium. Often, aquatic plants lack the essential CO₂, preventing optimal growth. With a CO₂ permanent test, the CO₂ level can be controlled with sufficient accuracy. The dye bromothymol blue used has the property of changing colour in a defined pH range.

CO₂ diffuses from the aquarium water through the air bubble in the permanent test into the test solution and vice versa. Depending on its CO₂ content, the pH value of the test liquid and thus its colour changes. A defined carbonate hardness in the test liquid determines at which CO₂ concentration a certain pH value is established. The Legend CO2 indicator solution turns light green when the pH value is around 6,6. This is achieved at a CO₂ concentration of 30 mg/l. For this reason, the Legend CO2 indicator solution indicates a light green tone at a CO₂ value of the aquarium water of  30 mg/l. If the CO₂ supply in the aquarium is less than  30 mg per litre, the test reagent remains blue; if the CO₂ supply exceeds the mark of 30 mg per litre, the test reagent turns yellow.

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