Penn Plax Cascade 600 Submersible Aquarium Filter Cleans Up to 50 Gallon Fish Tank With Physical, Chemical, and Biological Filtration

Penn-Plax Cascade 600 Fully Submersible Internal Filter – Provides Physical, Biological, and Chemical Filtration for Aquariums and Turtle Tanks

Penn-Plax Cascade 600 Filter Replacement Carbon Cartridges (2 Pack) – Provides Chemical Filtration for Freshwater and Saltwater Aquariums

Penn-Plax Cascade 600 Filter Replacement Bio-Sponge (1 Sponge) – Provides Physical and Biological Filtration for Freshwater and Saltwater Aquariums