Desalination makes seawater potable; Energy Recovery (ERI) makes desalination practical. The company designs, develops, and manufactures energy recovery devices used in sea water reverse osmosis (SWRO) desalination plants. The SWRO process is energy intensive, using high pressure to drive salt water through membranes to produce fresh water. The company's main product, the PX Pressure Exchanger, helps recapture and recycle up to 98% of the energy available in the high-pressure reject stream, a by-product of the SWRO process. The PX can reduce the energy consumption of a desalination plant by up to 60% compared with a plant lacking an energy recovery device. Subsidiary Pump Engineering also makes high pressure pumps.