Filmtec (LC LE PRO 4040) Brackish Water Low Energy Membrane 2,500 GPD 4 "X 40"The Filmtec LC LE PRO 4040 (formerly BW30LE 4040) is a low energy brackish water reverse osmosis membrane engineered to deliver 2,500 gallons per day at significantly reduced operating pressures, cutting energy costs while maintaining 99. 0% salt rejection. This 4" x 40" commercial grade element features a hard shell exterior for multi element housing configurations and provides 78 square feet of active membrane surface area. SPECIFICATIONS Filmtec LC