This vacuum is equipped with a HEPA replacement filter system that is easy to snap on and off for a quick replacement. Use it with a 15” HEPA Microfilter Upright Vacuum bag (sold separately). For optimum performance, frequently check the HEPA microfilter bag, and replace when it is near full capacity. Ensure that you are checking your vacuum belt frequently, and replace whenever the belt appears to be loose, or if you notice reduced suction power. HEPA filtration captures up to 99.97% of carbon dust and particles that are 0.3 microns or larger in size, and because it traps collected particles, your air and carpets remain cleaner longer.