3MDW311 Replacement Filter Cartridge Reduces particulate, chlorine taste and odor, chloramine, asbestos, parasitic protozoan cysts, lead, MTBE, trihalomethanes (TTHM) and VOCs Triple dual stage carbon-block filtration process provides cleaner, clearer better tasting drinking water Sanitary Quick Change (SQC) cartridge design helps provide fast and easy cartridge change-out with minimal effort