TAPTEC LCHF-4040 is a new and affordable 4-inch RO membrane From DuPont, the makers of FilmTec FilmTec is the gold standard of RO membranes with over 40 years of membrane innovation Specially developed for drinking water applications that require high flow rate TapTec's advanced membrane technologies achieve ultra-high flow Specifications Dimensions: 40 x 1.06 x 0.75 x 3.9 in Feed Spacer Thickness: 31 mil Average Permeate Flow Rate: 2800 gpd / 10.6 m3/d Minimum Salt Rejection: 98.5% Stabilized Salt Rejection: 99.0 % DuPont, Filmtec and TapTec are registered trademarks of DuPont