Abstract: A method of implementing and using an apparatus (1a,1b,13,25) to achieve hand sanitisation by application of ozone. The apparatus has a disinfecting chamber (3,3?,110) with at least one port (2) adapted for insertion of at least one hand into the disinfecting chamber (3,110). A sensor (4) detects entry and/or exit of the hand (26) into the disinfecting chamber (3,110). An ozone water output (7,130) of an ozone water supply (8) is arranged to deliver ozone water to the at least one hand (26) when inserted into the disinfecting chamber (3,110). Control means (6) times start and stop of a discharge of ozone water from the at least one ozone water output (7,130) into the disinfecting chamber (3,110) when the at least one sensor (4) detects entry of the at least one hand (26) into the disinfecting chamber (3,110).