Annual Replacement Kit for VistaClear™ Centralized Water Filtration System is a user-friendly, two-element kit designed to be installed inside system filter sump housings. Carbon block filter filters incoming municipal source water DentaPure™ cartridge treats waterlines in up to 10 operatories and reduces microbial contamination in waterlines to a maximum of 200 CFU/ml Contains: (1) Carbon Block filter (1) DentaPure Cartridge