The 3M™ CUNO® legacy drop-in style replacement Cartridge, model CFS117, when used in a drop-in style filtration housing, provides consistent quality water by reducing chlorine taste and odor through granular activated carbon. Our 3M™ CUNO® legacy drop-in style replacement Cartridge, model CFS117 , when used in a drop-in style filtration housing, is an economical way to reduce chlorine taste and odor in water through granular activated carbon. This replacement cartridge is a great choice for anyone looking for an inexpensive chlorine taste and odor reduction filter. 3M™ water filtration products systems and cartridges offer a wide range of solutions designed to address many types of water quality concerns. Third party certifications, such as NSF and WQA are an advantage provided on many 3M™ water filtration Products. 3M™ purification is a known leader in filtration technology recognized for innovation, trust and q quality around the world.