The Laguna Pressure Flo Filters represent the ultimate in water filtration & clarifying technology. superb mechanical & biological filtration combined with a high powered UV steriliser, will guarantee clear healthy water every time & with the unique backwash system routine cleaning is child's play. 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 & healthy. These all-in-one filters provide mechanical, biological & UV sterilization & 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 & comfortably in a few minutes without opening the lid. This feature ensures that the filters perform at optimal levels for many days & 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. Three year manufacturers guarantee