EHEIM 400L CO2 Set 200 And 400 difusser and bubble counter

The CO2 gas is atomized into many bubbles by the diffuser. The bubbles create a larger contact surface enabling the CO2 to dissolve quickly in the aquarium water. The bubble counter visually controls the dosing of the CO2. As a rough rule of thumb: approx. 20 mg CO2 per litre. This corresponds to about 10 bubbles per minute per 100 litres of water. Small, effective device with an integrated bubble counter and non-return valve. Easy to connect and attach to the aquarium pane with suction holder. Features: - Small, space-saving device - Highly efficient diffuser - Bubble counter for visual control of CO2 dosing - Non-return valve prevents water returning to the CO2 system - Hose protection - Powerful suction holder