MedicAir® Pro All-In-One Replacement Filter CartridgeThis all in one Nano coated carbon HEPA H13 TiO2 UVC Reaction Chamber Replacement Cartridge contains the following: 1 x Pre Filter 1 x H13 HEPA Filter 1 x Granulated Carbon Filter 1 x 24W Ultra Violet Type C (UV C) Bulb The filters are all integrated into one single and easy to replace cartridge solution. It features an outstanding 5000 hours lifespan or longer which is 9 months to a year according to usage and environment.