A filter cartridge (12) including a filtering body (54) having first and second porous filter walls (56,58). The second porous filter wall (58) having a density that is different than the first porous filter wall (56). The density of the second porous filter wall (58) being defined by interstitial spaces (S2). The filter cartridge further including discrete chemically filtering particles (80) that are captured within the interstitial spaces (S2) of the second porous filter wall (58) when the filtering body (54) is in a vertical filtering orientation.
