The Aquascape UltraKlean Pond Filter 3500 is a powerful and efficient filtration system designed for ponds up to 3,500 gallons. It uses a combination of mechanical and biological filtration to effectively remove debris and harmful substances from the water, promoting a healthy and balanced ecosystem for your aquatic life. The internal UV clarifier helps to eliminate green water and algae blooms, ensuring crystal clear water and optimal water quality. The filter features a unique backwash cleaning system that makes maintenance quick and hassle-free, allowing you to spend more time enjoying your pond and less time cleaning it. With its durable construction and reliable performance, the Aquascape UltraKlean Pond Filter 3500 is the ideal choice for pond owners looking for a high-quality and low-maintenance filtration solution.