Superior Rejection, High Flow, High Durability Equipped with fouling tolerant low dP spacer technology | LG BW R G2 membranes offer a combination of superior rejection, flow and durability and reduce total cost of ownership: suitable for high salinity brackish water and wastewater reuse applications. LG BW 400 R G2 membranes incorporate state-of-the-art feed spacer technology, which can greatly reduce differential pressure and cleaning frequency.