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Top Nature Aqua Aquarium Co2 Monitor
Invert your drop checker and fill the reservoir up half way with CO2 drop checker indicator solution. Using the suction cup, submerge the drop checker into your aquarium water and stick to the aquarium glass sides. Based on the concentration of your CO2 in your water, the colour of the solution will change.
TNA Aquarium Drop Checker
Attach the suction cup to the main unit and put five drops of reagent.
Mount the main unit to the tank approx. 5 cm below water level.
The reagent needs to be replaced once every 1 to 2 weeks according to the following procedure.
The colour of reagent in the ball changes according to the amount of CO2 dissolved in the water.
Compare the colour of reagent and the pH colour chart.