Generic Keurig Replacement Charcoal Water Coffee Filters Cartridge, Replaces Keurig 05073 with a Retail Box Set of 4 Charcoal water filter removes impurities: chlorine, calcium, bad tastes and odors and helps ensure deliciously fresh home-brewed coffee Each filter individually bagged and sealed to ensure brand new quality. (Comes with a Retail Box which can perfectly protects the filters) Generic charcoal filters specially designed to fit Keurig coffee machines featuring their premium charcoal water filtration Simple-to-install design; requires replacing every 60 days or after 60 uses, more often if you have hard water For use with the following Keurig brewers purchased after August 2007: Elite, Classic, Ultra, Special Edition, Ultimate and Platinum.