R.O. UltraTec’s newest residential membranes are manufactured with the industry’s leading film technology membrane flat sheet and are spiral wound to fit all standard size residential membrane housings. These 1.8- x 12-inch (45.72 x 304.8 mm) thin film composite (TFC) elements produce up to150 gpd (567.8 L/d) at 65 psi with a nominal rejection of 98 percent. All membranes are integrity tested and shipped dry for longer shelf life. NSF Standard 58 approved. http://www.roultratec.com, sales@roultratec.com