Danner Pondmaster Clearguard Pond Filter 5500 with 18W UV 5500 Gallon Capacity, with UV Light Fittings: 1 & 2 Slip & Barb Recommended Water Pumps: up to 6000 GPH Maximum Pressure: 15 PSI Not Included - Backwash Air Kit Needed: SMALL (Item #15660 w/AP-40)