Patent ID: 7425274

Claim:
A method for the filtration of, an aquarium said aquarium comprising an enclosure and housing fish said method comprising removably mounting a filtration unit to said enclosure surrounding said aquarium, said filtration unit further comprising a module frame removably mounted within a housing, said housing defining an internal chamber and having a water inlet and a water outlet; a mechanical filter cartridge removably mounted within said module frame; a chemical filter cartridge removably mounted within said module frame wherein said chemical filter cartridge includes at least one unit which contains a plurality of spaced apart compartments, each of which contains a quantity of activated carbon granules and wherein said granules do not completely fill each of said plurality of spaced apart compartments and wherein each compartment of said plurality of spaced apart compartments has an inlet opening arrangement and an outlet opening arrangement, said inlet opening arrangement being located at the bottom of said compartment, said outlet opening arrangement being located at the top of said compartment; a pump for bringing water up through said water inlet from said aquarium to be filtered through said module; and a weir extending from said housing and providing a channel through which said water returns from said water outlet to said aquarium; activating said pump so that water from said aquarium passes through said water inlet into said internal chamber and through said module over said weir and back into said aquarium; discarding said mechanical filter cartridge when said mechanical filter cartridge becomes clogged, thereby preserving said chemical filter cartridge until said chemical filter cartridge becomes clogged; replacing said mechanical filter cartridge; discarding said chemical filter cartridge when said chemical filter cartridge becomes clogged; and replacing said chemical filter cartridge.