PENN PLAX (CIF4) Cascade 170 Submersible Aquarium Filter Cleans Up to 10 Gallon Fish Tank or Terrarium With Physical, Chemical, and Biological Filtration Fully submersible aquarium filter quietly delivers 45 gallons per hour of crystal clear water for your small aquarium or terrarium up to 10 gallons in size. Suitable for both freshwater and saltwater environments. Activated carbon cartridge removes harmful chemicals, toxins, odors, discoloration, and other contaminants from your aquarium or tank. Internal sponge optimizes colonization of beneficial aerobic bacteria. Pump head with adjustable and directional water flow. Cascade internal filters provide better filtration; physical, chemical and biological while also aerating water. Spray bar option allows you to distribute water evenly helping aerate your tank. Fish tank filter can be placed horizontally and is easily hidden.