The GE Desal AK3218T Ametek reverse osmosis elements are used for brackish water desalination. The Desal AK3218T RO element is tape wrapped. The A-Series thin-film reverse osmosis membrane elements are characterized by high flux and excellent sodium chloride rejection. GE Osmonics Desal AK3218T High Rejection Brackish Water reverse osmosis elements feature a tape outerwrap and 28 mil feed spacers and are designed with flush end connections. These elements allow significant energy savings. The GE Desal AK3218T is designed to replace a 20-inch Ametek element by fitting into an Ametek housing that has been equipped with a brine control valve.