Single-use CO2 fertilization system complete set. Plants provide the aquarium with vital oxygen for its inhabitants, prevent algae growth, remove pollutants, offer hiding spots, and reduce disease pathogens. The plant fertilization system supplies the plants with the main nutrient CO2 through the water. Plants absorb this through their leaves. The system is fully ready for connection. Screw the pressure reducer onto the CO2 supply bottle. Connect the pressure reducer to the diffuser in the aquarium via a hose. CO2 is then introduced into the aquarium and dissolved in the water with the help of the diffuser. The CO2 supply can be interrupted at night using an intermediate solenoid valve. The supply bottle is tested and equipped with a pressure relief device. The check valve prevents water from entering the bottle. The range of a CO2 system depends on various factors. Key factors include carbonate hardness, the quantity and type of plants, and the strength of water surface movement. A 500 g bottle that is not turned off at night by a solenoid valve lasts about 4 months with basic adjustment.