A method of sanitising treated water of an unsatisfactory quality so as to produce sanitised water which of a satisfactory quality; the method comprising the steps of: - receiving treated water from a water supply at an inlet to a water sanitisation assembly; - filtering the received treated water in an inlet particle filter to partially sanitise the treated water; - passing the filtered water through a non-return valve located before an irradiator, whereby, the irradiator is provided by an ultra violet reactor comprising an ultraviolet lamp, and, whereby the filtered water is only passed into the irradiator after the ultraviolet lamp has become operational such as to act as a germicidal barrier and create ozone for an aerator; - irradiating the filtered water in the irradiator to further sanitise the filtered water; - ozonating the irradiated water in the aerator to sanitise the irradiated water; - storing the sanitised water in a sanitised water tank; and, - upon demand by a user, activating a controlled pump to pump the sanitised water out of the sanitised water tank and through an outlet filter so as to flow along a potable water supply and arrive at a dispensing outlet; characterised in that, the method further comprises the step of a periodical refresh cycle comprising: - using a return conduit which is arranged intermediate the potable water supply and the irradiator, and which has a valve and a non-return valve, - upon command of a central controller, ensuring that the irradiator is operational and opening the valve to allow the sanitised water to become refreshed by flowing through the return conduit such that, the sanitised water to be refreshed is passed through the irradiator and the aerator, thus allowing a periodic refresh of the sanitised water in the sanitised water tank. - receiving treated water from a water supply at an inlet to a water sanitisation assembly; - filtering the received treated water in an inlet particle filter to partially sanitise the treated water; - passing the filtered water through a non-return valve located before an irradiator, whereby, the irradiator is provided by an ultra violet reactor comprising an ultraviolet lamp, and, whereby the filtered water is only passed into the irradiator after the ultraviolet lamp has become operational such as to act as a germicidal barrier and create ozone for an aerator; - irradiating the filtered water in the irradiator to further sanitise the filtered water; - ozonating the irradiated water in the aerator to sanitise the irradiated water; - storing the sanitised water in a sanitised water tank; and, - upon demand by a user, activating a controlled pump to pump the sanitised water out of the sanitised water tank and through an outlet filter so as to flow along a potable water supply and arrive at a dispensing outlet; - using a return conduit which is arranged intermediate the potable water supply and the irradiator, and which has a valve and a non-return valve, - upon command of a central controller, ensuring that the irradiator is operational and opening the valve to allow the sanitised water to become refreshed by flowing through the return conduit such that, the sanitised water to be refreshed is passed through the irradiator and the aerator, thus allowing a periodic refresh of the sanitised water in the sanitised water tank.