Package Included: 1 Pack -- 1x Extra Original HEPA Filter for HC3 Genunine 3 Stage Filter Replacements for SimPure HC3 Air Purifier Only Compatible: SimPure HC3 Air Purifier. HC3 air purifier filter is designed to use with your SimPure HC3 (sold separately) to extend the air purifier's life. (1 Pack) Storage & Use: Filter is sealed to preserve shelf life. Please remove the filter from the plastic bag before placing into the SimPure HC3 air purifier. High Quality HEPA Filter: Filters out 99.97% particles as small as 0.3 microns and air pollution of PM 2.5 (particulate matter). The unfolded length of the filter can reach 13.1 feet (4 meters), and the service life can reach 4-6 months! 3 Filtration Technology: HC3 Air Purifier features a 4-stage filtration design: Pre-Filter - Captures Hair, Pet Dander and Fiber; TRUE HEPA Filter, Antibacterial Filter - Captures Smoke, Allergens, Dust, Pollen; Activated Carbon Filter - Quickly captures and neutralizes Bad Smells, Pet Odor and VOC to freshen the air quality.