This is a replacement filter for the Filtrete 3US-MAX-S01 Under Sink Water Filtration System, which is an under sink water filtration system that connects to the kitchen or bath faucet.  
                                                             
                                                             
                                                             
 Improve the taste and quality of the water in your home from a trusted name in water filtration. 
 Tested and Certified by NSF International, one of the world’s most respected independent certification organizations, to NSF/ANSI 42 and 53. 
 Find the level of filtration that works for your family and reduce chlorine taste and odor, sand, sediment, rust, silt and more. 
 Filtrete Maximum Under Sink Quick Change Water Filtration Replacement Filter 3US-MAX-F01 
 This replacement cartridge is designed for use with System 3US-MAX-S01 and reduces 99% lead, 99.95% microbial cysts, 97% chlorine taste and odor, select VOCs, select pharmaceuticals, plus 0.5 microns of sand, sediment, rust and soil that may be in your water. It features a Sanitary Quick Change design that requires a simple quarter turn for installation with no spilled water or mess to clean up. The cartridge has a 6-month filter life and a slim, compact design that takes up limited space under the sink.