Patent ID: 7670484

Claim:
A filter cartridge for use in an aquarium filter, the filter cartridge comprising: a) a filtering body defining a non-pocketed interior volume, the filtering body including: i) a first porous filter wall having a first density; and ii) a second porous filter wall having a second density, the second density being defined by interstitial spaces between inner and outer sides of the second porous filter wall; and b) chemically filtering media located within the non-pocketed interior volume of the filtering body, the chemically filtering media being in the form of a plurality of discrete particles, the plurality of discrete particles defining a media volume significantly less than that of the interior volume, the discrete particles having a sieve mesh size of 6 through 14; c) wherein a majority of the discrete particles is captured within the interstitial spaces of the second porous filter wall when the filtering body is in a vertical filtering orientation such that the discrete particles are distributed and retained across a majority of a downstream face area of the filter body.