Ocean Clear 380 Canister Filter with 154 sq. ft. Polystrand dual density cartridge with 18 watt U.V. filter. Acombines multi-function pond filter of 154 square feet of polystrand (in dual densities) around a high efficiency 18 watt Ultraviolet Sterilizer for superior algae and green water control. This filter handles ponds up to 1280 and is set in a modular format for adding on multiple filters. The UV sterilizer is UL listed and approved for outdoor use. This item is a special order item only.