High Rejection, High Durability Equipped with fouling tolerant low dP spacer technology | LG BW R Dura membranes offer a combination of high rejection and durability and provide extended product life even under harsh cleaning conditions: suitable for high salinity brackish water and wastewater reuse with challenging feed water conditions. LG BW 400 R Dura membranes incorporate state-of-the-art feed spacer technology, which can greatly reduce differential pressure and cleaning frequency.