Filmtec (BW30LE-4040) Brackish Water Low Energy Membrane 2,500 GPD 4 "X 40"Filmtec Commercial RO Membrane Filmtec BW30LE 4040 Brackish Water Low Energy Membrane 2,500 GPD high performance brackish water membrane engineered for lowest operating pressure and maximum energy efficiency in light industrial reverse osmosis systems 4" x 40" 99. 0% Rejection 78 ft Active Area Low Energy WHY IT WORKS Designed for brackish water applications where energy costs matter Low Energy Design The BW30LE 4040 operates at significantly lower