a schematic cross sectional view of a water filtration and sterilisation device according to the present invention and fig2 shows an external perspective view from above and to one side of a water filtration and sterilisation device according to the present invention referring firstly to fig1 there is shown a water filtration and sterilisation device generally designated 10 the device includes a casing 12 within which there are provided upper and lower containers 14 16 advantageously the upper container 14 has a volume which is substantially equal to that of the lower container 16 the casing 12 may be provided with a removable lid not shown which covers and closes the upper container 14 fig1 shows the containers 14 16 being positioned one above the other in an alternative embodiment the upper container 14 may be nested within the lower container 16 in the same manner as a conventional water filter jug the base 18 of the upper container 14 is provided with a recess 20 within which there is provided a removable filtration cartridge 22 the filtration cartridge 22 contains a filtration medium which in use removes particulate matter chemicals and metals from water passing therethrough the recess 20 is provided with an outlet conduit 24 which permits fluid passing through the cartridge 22 to pass to the lower container 16 within the outlet conduit 24 there is provided a valve 26 which is operable to open and close the outlet conduit 24.