A replaceable filter cartridge assembly for a liquid filter and a liquid filter in which such a filter cartridge is installed. The filter cartridge 10 is provided with a support element 15, and a seat 20 for a sealing membrane 19 is provided on the support element 15. The sealing membrane seals the inlet 22 of the housing via a sealing edge 21 that acts as a return flow barrier over the inlet. The sealing membrane 19 also has a radial sealing surface 23 to provide a seal between the support element 15 and the outlet port 24 of the filter. This permits the filter cartridge to be manufactured in a particularly cost-effective manner and assures simple mounting within the housing. Since only the filter cartridge, which can be pushed onto the support element 15, needs to be exchanged, very little material has to be disposed of when the filter is replaced, which further increases the cost-effectiveness of the filter in use.