Out of pond filter with pressure discharge. Provides biological filtration. Can be partially buried to conceal. Availability: 750 Model - For ponds up to 750 gallons, use 300 to 600 GPH pump, not included. 1" ID tubing connections. 9 watt UV included. 3000 Model- For ponds up to 1100 gallons, use 1000 to 1200 GPH pump, not included. 1" ID tubing connections. Includes an easy maintenance backflush valve & a 9 watt UV.