With the CO2 system JBL ProFlora CO2 Set Advanced you are well equipped and have a CO2 system that brings decisive advantages. There are three models to choose from, which are identically equipped except for the CO2 pressurized gas cylinder. In addition to an effective CO2 diffuser, the JBL ProFlora CO2 Advanced systems have a solenoid valve for night shut-off and a pressure gauge with two pressure gauges that indicate the working pressure and the false pressure. The night shut-off can be easily controlled by a timer and serves to switch off the CO2 system during the night. During darkness the water plants do not absorb CO2. Without night shut-off, the oxygen content in the aquarium can change negatively.Why a CO2 system is necessary in the aquarium:: Plants provide the aquarium with vital oxygen for your aquarium inhabitants, prevent algae growth, remove pollutants, provide hiding places and reduce pathogens. Plant fertiliser systems with CO2 cylinders supply the plants with the main