Low pressure (LP) and low energy (LE) reverse osmosis membranes are designed for ultimate efficiency. As pressure and energy are interrelated in reverse osmosis, the terms are generally interchangeable.
LP/LE elements may be operated at low pressure to achieve energy savings, or instead run at the same pressure as standard elements to increase flow. Typically, the trade off with reverse osmosis membranes is between flow and rejection, so required permeate quality will need to be considered carefully. LP/LE elements are ideal for low salinity applications.