The Costway 4000 Gallons Pond Pressure Bio Filter with 13W UV Light is designed to keep your pond, fountain, or aquarium water crystal clear and free from algae. Constructed from high-quality ABS material, this filter is resistant to sunlight and aging. It features a UV bulb system that inhibits algae growth and bio sponges that ensure optimal water flow and the reproduction of beneficial nitrifying bacteria. The dual outlet design promotes effective water recycling, while the self-cleaning function makes maintenance a breeze. The package includes various hose adapters and detailed instructions for easy setup and operation.