Danner Pondmaster Clearguard 2700 Gallon Capacity Pond Filter with UV 2700 Gallon Capacity, with 9 Watt UV Light Fittings: 1" Slip & Barb Recommended Water Pumps: up to 3000 GPH Maximum Pressure: 15 PSI For ultimate backwash performance Backwash Air Kit Needed: SMALL (Item #15660 w/AP-40)