A water filter assembly for filtering water, adapted to be coupled to piping of a piped water system, the water filter apparatus comprising: a housing having first and second housing ends (21, 22), the housing having an inlet and an outlet located at the first housing end, the second housing end having an opening, the housing being for removably receiving a filter element assembly through the opening in the second housing end, and a housing bottom cover releasably mountable over the opening in the second housing end, wherein the housing bottom cover has a mounted position wherein it is mounted in sealing engagement over the opening in the second housing end, the assembly further comprising retaining means for retaining the housing bottom cover in its mounted position relative to the housing, wherein the retaining means mounts over the housing bottom cover in use so that the housing bottom cover is between the retaining means and the opening in the second housing end when assembled, wherein the retaining means has an inner and an outer side, the inner side facing towards the housing when assembled thereto, the retaining means comprising at least one protruding member that extends away from the outer side, and wherein the retaining means comprises a circlip having two free ends, said at least one protruding member comprising at least two protruding members located one at each free end of the circlip such that they extend away from the outer side of the circlip, the at least two protruding members being arranged such that a user can pinch them to compress the circlip, wherein the circlip can be mounted relative to the housing in a mounted position to retain the housing bottom cover to the housing, the housing bottom cover having a mounted position wherein it is sealed against the housing, the second end of the housing terminating at a terminal edge, wherein the assembly is adapted so that the housing bottom cover can be placed in the opening in the second end of the housing and the circlip placed over it with the at least two protruding members extending proud from the terminal edge of the housing such that the housing bottom cover can be driven into its mounted position by pushing the second end of the assembly against a surface. a housing having first and second housing ends (21, 22), the housing having an inlet and an outlet located at the first housing end, the second housing end having an opening, the housing being for removably receiving a filter element assembly through the opening in the second housing end, and a housing bottom cover releasably mountable over the opening in the second housing end, wherein the housing bottom cover has a mounted position wherein it is mounted in sealing engagement over the opening in the second housing end, the assembly further comprising retaining means for retaining the housing bottom cover in its mounted position relative to the housing, wherein the retaining means mounts over the housing bottom cover in use so that the housing bottom cover is between the retaining means and the opening in the second housing end when assembled, wherein the retaining means has an inner and an outer side, the inner side facing towards the housing when assembled thereto, the retaining means comprising at least one protruding member that extends away from the outer side, and wherein the retaining means comprises a circlip having two free ends, said at least one protruding member comprising at least two protruding members located one at each free end of the circlip such that they extend away from the outer side of the circlip, the at least two protruding members being arranged such that a user can pinch them to compress the circlip, wherein the circlip can be mounted relative to the housing in a mounted position to retain the housing bottom cover to the housing, the housing bottom cover having a mounted position wherein it is sealed against the housing, the second end of the housing terminating at a terminal edge, wherein the assembly is adapted so that the housing bottom cover can be placed in the opening in the second end of the housing and the circlip placed over it with the at least two protruding members extending proud from the terminal edge of the housing such that the housing bottom cover can be driven into its mounted position by pushing the second end of the assembly against a surface.