CSM RE4040-BLN - 4" x 40"; 2600 GPD TW-LE Low Energy Replacement Reverse Osmosis MembraneCSM Toray RE4040 BLN Low Energy Commercial RO Membrane 4" x 40" thin film membrane engineered for brackish and tap water filtration at reduced operating pressures 2,600 GPD @ 150 PSI Low Energy Design 24 Month Service Life Commercial Grade The CSM RE4040 BLN is a 4 inch by 40 inch reverse osmosis membrane built for commercial applications where brackish or tap water needs treatment under lower operating pressures. Rated at 2,600 gallons per day at 150