Kent Marine Phos-Reactor Multi-Purpose FilterThe Kent Marine Phos-Reactor Multi-Purpose Filter is primarily intended to be used with phosphate-removal medi such as Kent Power-Phos and Phosphate Sponge, however, it may be used with numerous filtration media to best suit the changing needs of the aquarium. Depending on the choice of media, the Phos-Reactor may be used as a fluidized-bed filter, exposing the maximum amount of the media's surface area to aquarium water, hence increasing filtration efficiency. The Phos-Reactor may be employed as a hang-on-tank or in-sump filter, depending on your aquarium set up.The Kent Marine Phos-Reactor is built from high-quality acrylic and ABS, and utilizes a unique twist-lock head that eliminates the need for tedious thumb-screws. The intelligent design of the Phos-Reactor makes set up very simple; in contrast to cmpeting filters, no additional elbows or other pluming pieces are required for basic operation. The compact size and effectiveness of this filter makes it ideal for use on nano-reefs and other small aquaria. For freshwater aquariums up to 300 gallons and for marine aquariums up to 150 gallons. Multiple units may be required for desired results.*Requires a submersible pump with a flow rate of 40 to 100 gph at 0' when media present.