The Sun HW-5000 UV 4 stage canister filter is ideal for mid to larger tanks It handles up to 4600 L per hour. this filter achieve excellent mechanical, chemical and biological filtration. A built in 9 Watt UV sterilizer helps control algae spores/bacteria and promotes clear water. 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.