The Sun HW-303B external 4 stage canister filter is ideal for tanks up to 100 gallon It handles up to 370 gallons per hour. Includes filter pads, hoses and all the parts you need to get started The three flexible media trays allow you to add other filtration media such as Sun Sun's activated carbons, ceramic rings or bio-balls (each sold separately) to achieve excellent mechanical, chemical and biological filtration A built in 9 Watt UV sterilizer helps control algae spores/bacteria and promotes clear water The HW-303B canister filter also has a convenient self-priming pump that eliminates the need for manual siphoning. Good for up to 100 gallon fish tanks. Canister filters are very easy to install and maintain. You need not clean this as frequent as you clean the Top filter or internal filters. Frequent opening and closing might damage the O ring or otherwise known as Gasket Dimension: 105" L X 105" W X 16" H Pump Power: 35W Built in 9 Watt UV sterilizer for controlling algae spores/bacteria and promoting clear water.