Hygiene unit for F5L-Mix single lever mixer, projection 125 mm, for performing automatic hygiene flushing and program-controlled thermal disinfection. Function block with 2 solenoid valve cartridges and electronic control unit made of plastic for wall-mounting, for battery or mains operation, 6 V DC. Activated water hygiene flushing, fixed interval of 24 hours and saving of statistical data. With option for parameterization and communication via optional, bidirectional remote control.