How to Use: 1. Connect the refiner to the CO₂ decompression gauge with a special trachea, and then place the refiner in the fish tank, and the location is suitable for the middle. 2. Before the refiner is connected to the trachea, first inject water into the elbow of the refiner. After connecting the trachea to open the air valve, the air pressure pushes the water into the refiner cavity to realize the bubble counting function. 3. It is necessary to slowly adjust the CO₂ gas output, and calculate the CO₂ addition amount through the bubbling speed of the refinement cavity, and adjust the gas volume appropriately according to the size of the fish tank and the variety of aquatic plants. Specification: Item Type: Fish Tank CO₂ Refiner Material: Acrylic Application: Fish Tank Carbon Dioxide Meter Bubble Refiner Package List: 1 x Fish Tank CO₂ Refiner1 x Suction Cup Note: Please allow some errors due to manual measurement.