BOYU EFU-10 External Canister Filter has a medium capacity, high efficiency, and multifunction. 5-Watt UV sterilizer to help kill algae spores and bacteria. The UV sterilizer also promotes clear crystal water. The BOYU EFU-10 canister filter also has a convenient self-priming pump that eliminates the need for manual siphoning, a Multilayer filtering function, and separate switch control. The water inlet and outlet are integrated with the valve. It has easy maintenance. Appropriate use of the marine and freshwater aquariums.