The device has a housing, water inlet (4), water outlet (5) and a filter (9) compressible by an actuating device in the housing. The filter is arranged in a flow path between the water inlet and water outlet, and provided with a water inflow surface and a water outflow surface. The water outflow surface forms a channel (14) in which water is transported toward the water outlet. The channel is fillable with the water over a surface of the filter. The filter has a central recess, and the water outflow surface is partially formed by a side of the filter.
