Filmtec (BW30PRO-365) Brackish Water Membrane 9,500 GPD 8"X40"The Filmtec BW30PRO 365 is a commercial grade 8"40" brackish water reverse osmosis membrane delivering 9,500 GPD with 99. 5% salt rejection, engineered for challenging feed streams where durability and cleanability are non negotiable. With 365 ft of active surface area and the industry's thickest 34 mil feed spacer, this element withstands difficult conditions and supports the widest cleaning pH range (1 13) for maximum operational longevity.