Aquarium CO2 Solenoid Valve - CO2 interrupter for aquascaping

You use a solenoid valve to turn off the CO2 supply when the lighting is switched off (or slightly earlier). You can prevent wasting CO2 this way because an aquarium does not need CO2 during the night. You can set the start time for CO2 fertilisation as well as the stop time for CO2 fertilisation .