The Dow Chemical Co., of Midland, Mich., has introduced a new line of low energy, water purification membrane products for commercial and light industrial applications. The new products, FILMTEC Extra Low Energy (XLE) series elements, will replace FILMTEC TW30LE series membranes. These new products are targeted for systems producing up to 10 gallons of water per minute (ca. 2 m3/hr) where low pressure operation is desired.