Hygiene unit for F5L single-lever mixers as wall mixers for sanitary and shower facilities, for performing of automatic hygiene flushing and program-controlled thermal disinfection (additional bypass solenoid cartridge necessary) and storage of statistical data. Housing adapter including sensor with control electronics and 6 V lithium battery (CR-P2) as well as function block with solenoid valve cartridge. Activated water hygiene flushing (30 seconds), fixed interval time 24 hours and saving of statistical data. With option for parameterization and communication via optional, bidirectional remote control.