Replacement DOW 40 inch Reverse Osmosis Membrane

DOW FILMTEC SW30-2540, authentic made in USA, 40 inch Reverse Osmosis Membrane. 
These membrane reverse osmosis membrane offers high productivity and maintain excellent salt rejection. This is not some cheap Chinese compatible membrane, this is the original made in USA Dow filmtec membrane, do not use imitations, they do not work as well. 
They have one of the highest flow rates available to meet the water demands of both sea-based and land-based desalinators.