The Laguna Powerfalls Filter Spillway can be installed in or above ground and is easy to use and maintain. A faceplate is included to allow easy liner attachment. The unit has a 38 mm (1-1/2 in) threaded bulkhead for making a hose connection to a circulating pump. As water flows through the Filter Spillway, it passes through filter foam and biomedia, both providing mechanical and biological filtration. Completely filtered water then exits the unit over a 37 cm (14-1/2 in) wide spillway in stunning waterfall fashion. The Filter Spillway is made of solid, professional grade fiberglass that will provide lasting durability.