InSinkErator F-201R Replacement Water Filter Cartridges for Water Filtration Systems and Hot Water Dispensers, 2-Pack Under Sink Water Filters ,White 1 Made in USA or Imported Replacement water filter reduces chlorine and odor for clean, great-tasting water Sanitary, quick-change filter cartridge makes replacement fast and easy Recommended filter cartridge replacement every 6 to 12 months for optimal performance filtering water Includes 2 InSinkErator F-201R replacement water filter cartridges for instant hot water dispensers and F-201 Filtration System NSF Standard 42 Listed Certification. NSF is a Public Health and Safety Organization that has strict standards for public health protection