New Authentic Dow Filmtec BW60-1812-75 75 GPD High Rejection Reverse Osmosis Membrane manufactured in the USA. Most recent version with QR authentication code on membrane, verifiable using the DUPONT Water App. This membrane replaces Filmtec TW30-1812-75 membrane. Dow Filmtec is the #1 selling membrane in the world, delivers up to 20% greater water production than comparable brands, and is known for outstanding quality. Each membrane contains a QR code for verification of authenticity. Maximum Operating Temperature 113°F (45°C) Maximum Operating Pressure150 psig (10bar) Maximum Feed Flow Rate 2.0 gpm (7.6 lpm) pH Range, Continuous Operation 2–11 Maximum Feed Silt Density Index (SDI) SDI5 Stabilized salt rejection 98% (performance measured by manufacturer at 250 ppm NaCl, 77F, and 15% water recovery) Free Chlorine Tolerance