The Zetazanz AMF Cartridge can be supplies with a choice of background fragrances to further enhance the experience. Replace the cartridge every 6 months. The AMF cleans, captures and kills bacteria in the air, this air is then positively charged with Anti-Bac from the Zetazanz AMF Cartridge. the clean positively charged air fills the vacuum sealed chamber of the machine, the air then exits the machine into the atmosphere.