Electrolux EL500 Air Purifier Annual Replacement Filter Kit Carbon filter: A very effective carbon filter sheet collects large particles, dust, hair and lint, as well as odors caused by cigarette smoke, organic decay, and cooking HEPA filter: Captures 99.7% of particles and impurities as small as .3 microns, including smoke, dust and pet dander. Plasma Wave Technology: In the final stage of cleaning, Plasma Wave Technology generates both positive and negative ions to create plasma clusters that instantly neutralize viruses, bacteria, chemical vapors and odors in the air. Replace every year 2- Year Warranty