Key Features Max Flow 20000 LPH Powerful Pond pump with high output Can be used as a submersible pump or dry mounted External unit that controls flow but the touch of a button Quiet and Reliable thanks to a six pole and three phase motor The Evolution Aqua 20000 Varipump is a powerful Pond pump that produces high output for the most demanding of ponds. Varipump is a controllable unit that uses an external digital display control box to power the pump. A simple to use button allows you to adjust the output and energy consumption of the unit. Because of a six pole and three-phase internal motor, the Varipump is a quiet and reliable pump as well as being powerful enough to run in a larger pond system. Each pump has a strong cage covering the main section that allows easy water flow but restricts large debris from coming into contact with the rotor inside. The Varipump can be installed either dry, as part of a gravity-fed filter system, or submersed in water as part of a pump-fed system.