Abstract: An aquarium filter for removing chemical and physical waste from an aquarium. The filter can include a mechanical filter portion, followed by a fluidized bed of particles, such as sand, for removing ammonia from the water and then a chemical filter portion. The filter can be constructed in an aesthetically desirable manner and can be convenient to maintain.

Abstract: An aquarium filter is provided having a first annular chamber and an inlet or near the top of the chamber. The inlet is constructed and positioned to direct water into the chamber in a swirling direction, concentric with the annular wall. The first chamber also includes a first water outlet at the top of the chamber for filtered water to exit the chamber. The first chamber also includes a waste outlet at the bottom of the chamber. As water enters the first chamber from the inlet, it swirls in the chamber, creating a vortex. Particles within the water are forced against the annular wall, slide down the wall and migrate towards the waste outlet at the bottom of the chamber. A collector, such as a simple collection pot can be coupled to the waste outlet and particles separated from the water will collect in the pot. A selectively closeable cleaning outlet at or near the bottom of the collection pot can be used to empty the material collected there.

Abstract: An aquarium filter for removing chemical and physical waste from an aquarium. The filter includes a fluidized bed of particles, such as sand, for removing ammonia from the water. The filter can also include a physical trap for solid material and activated charcoal for removing organic material from the aquarium water. The filter can be constructed in an aesthetically desirable manner and can be convenient to maintain.

Abstract: An aquarium filter for removing chemical and physical waste from an aquarium. The filter includes a fluidized bed of particles, such as sand, for removing ammonia from the water. The filter can also include a physical trap for solid material and activated charcoal for removing organic material from the aquarium water. The filter can be constructed in an aesthetically desirable manner and can be convenient to maintain.