... ,On/Off ,Ozone output adjuster ,Pressure regulator ,Trouble alarm, Emergency stop device .SpecificationsItemUnitCH-WZQ 50GCH-WZQ 30GCH-WZQ 20GCH-WZQ 10GFlow rate ... , no need to clean, for saving water.PDO air intake device produces abundance air bubble, for high separate efficiency.Using two ...