Made in United States, the Reverse Osmosis water filtration technology Membrane SWC5-LD-4040 is Low Fouling Spiral Wound Composite Polyamide. The advantages in using the Hydranautics (Nitto) SWC5-LD-4040 Membrane are each membrane offers the highest productivity and salt rejection rates in the industry combined with the optimized flow, low fouling and low energy consumption, designed to provide optimum salt rejection and permeate flows, membranes of choice when lower permeate TDS and lower feed pressures are needed, offer highest energy efficiency at lowest costs, and delivering consistent high quality outputs at lower fouling, provides high flow, and excellent salt and boron rejections at low operating pressures, and does not need to be cleaned frequently thus reducing treatment cost while offering extreme durability and consistent performance. Hydranautics (Nitto) is a United States company well known for high-quality Membrane manufacturing for effective Reverse Osmosis water filtration technology.