LAGUNA: PRESSURE-FLO 700 UVC FILTER High Performance pressurized pond filters with integrated UV sterilizer/clarifier Laguna Pressure-Flo Filters are high performance water filtering systems that keep pond water clean and healthy. These all-in-one filters provide mechanical, biological* and UV sterilization and are designed to work in tandem with a solids handling pumps such as Lagunas Max-Flo. They also feature a revolutionary Backwash-Cleaning System that easily cleans the entire surface of the foam filters without opening the filter. This patent-pending system is one of a kind. Backwash cleaning can be done easily and comfortably in a few minutes without opening the lid. This feature ensures that the filters perform at optimal levels for many days and prolongs the time between full maintenance sessions. An easy-view cleaning indicator signals when its time to perform backwash cleaning. The units can be installed in or above ground. EPA Registered * Pressure-Flo 700 does not have a biological filtration chamber Lag1500: 700UVC For ponds of 330 to 660 gallons. Max flow 330gph. 11wt UV. Lag1502: 1400UVC For ponds of 660 to 1320 gallons. Max flow 660gph. 11wt UV. Lag1504: 2100UVC For ponds of 1050 to 2110 gallons. Max flow 1057gph. 20wt UV. Lag1506: 3200UVC For ponds of 1580 to 3170 gallons. Max flow 1585gph. 25wt UV.