Abstract: A washing machine having a washing volume and a mixing chamber below the washing volume and fluid communication therewith by means of a drain outlet at the underside of the washing volume. The mixing chamber receives water from the mixing volume through the drain outlet. At least one sparger is disposed within the mixing chamber for connection to an ozone source to introduce ozone into the water within the mixing chamber. The sparger is configured to introduce at least some ozone into the water within the mixing chamber in a downward direction away from the washing volume.

Abstract: A washing machine includes a washing volume for receiving laundry. The washing machine also includes an ozone inlet for providing ozone to the washing volume and an ozone outlet for receiving gaseous ozone from the washing volume. An ozone sensor is provided for measuring the gaseous ozone passing through the ozone outlet. A controller may be connected to the ozone sensor to receive an ozone measurement and to determining a degree of disinfection by the washing cycle.