True HEPA filter for LivePure Aspen Series air purifiers. True HEPA filtration is medical grade filtration, and captures up to 99.97% of particles as small as 0.3 microns from the air. HEPA filters are effective at filtering particles including smoke, dust, pollen, pet hair and dander, and mold spores. Recommended to replace HEPA filter every six (6) months for maximum efficiency. What You Get: Additional Information: