FilmTec SW30-4021 Elements have one of the highest flow rates available to provide the highest productivity while maintaining excellent salt rejection to meet the water demands of both sea-based and land-based desalinators. FilmTec SW30-4040 elements may also be operated at lower pressure to reduce pump size, cost, and operating expenses. Fully automated and precise element production enables the most consistent products in the industry for the most consistent product performance available. Features: Improved DUPONT FilmTec seawater reverse osmosis elements offer the highest productivity while maintaining excellent salt rejection. DUPONT FILMTEC SW30 membrane elements have the highest flow rates available to meet the water demands of both sea-based and land-based desalinators. DUPONT FILMTEC SW30 elements may also be operated at lower pressure to reduce pump size, cost and operating expenses