A filter assembly (20) is described that includes a substantially recyclable filter cartridge (30) inside a pressure vessel (22). The invented filter cartridge comprises substantially non-pressure bearing walls, except for a pressure-bearing neck (44) that is adapted to withstand high pressures preferably in the range of about 500 psi (34, 47. 10 Pa) from the inside. The walls of the filter cartridge that are incapable of withstanding significant internal pressure are surronded on the outside by a pressure vessel (22). The invented cartridge need not seal ot the pressure vessel, because the cartridge neck (44) protrudes outside of the pressure vessel (22) to seal directly to a filter head. The cartridge preferably includes a quick-disassembly mechanism for allowing quick and non-destructive access to the internal components and media of the cartridge.