Pentair Water Purification’s GRO high-performance RO membrane boasts a 50-percent recovery rate, while maintaining a retrofitable design. It comes in three different gpd models: 36, 50 and 75. Each is NSF/ANSI Standard 58-certified for materials and structural integrity in addition to NSF list component performance claims. Its innovative element design integrates a 100-percent dry membrane to help maximize lifespan and provide enhanced performance. The membrane offers 2.5 times the recovery over standard RO elements, high rejection stability at high input and an enhanced rejection performance. http://www.waterpurification.pentair.com