| 摘要 |
A reservoir (12) of a water filtration system (10) carries a projection such as a fin (32) on its outer surface. The reservoir (12) is removably received in a housing, such as a pitcher, such that the projection engages a shelf (30) in the housing. A passage in the reservoir can have a nonuniform taper that corresponds to the outer surface of a water filtration cartridge (20). A grippable member such as an indicator dial can be movably attached to the outer surface of the housing. For each orientation, use indicia on the grippable member align with use indicia on the outer surface of the housing. A water filter cartridge for the filtration system can have an inner surface, the inner surface having first and second portions. The second portion is about as long as the first portion, and is tapered. The cartridge can also have two ridges on the inner surface, both projecting inward towards the center axis of the cartridge.
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