Koch Membrane Systems Inc., of Wilmington, Mass., the world leader in membrane separation technology, has extended its range of selective rejection nanofiltration (NF) membranes for water and wastewater treatment with the launch of its new Fluid Systems TFC-SR2 element. Operating at extremely low pressures, typically 50 psi (3 Bar), the membrane is very energy efficient and capable of producing more water per square meter (m2) of membrane surface area than competitive products.