The PX-140S Pressure Exchanger is part of ERI®’s 4S-Series dual energy recovery device product line. 4S Series PX® devices are ideal for small to medium-size SWRO applications. The PX-140S is a dual rotor unit designed to handle brine flows from 20 to 32 m3/hr (90 to 140 gpm), corresponding to permeate flows of 400 to 650 m3/day when operating at 45% recovery. These units are typically used in parallel to service larger systems. The 4S-Series incorporates design improvements that increase the capacity and improve the durability.