Original BISSELL Replacement Filter, HEPA + Pre-filter for BISSELL Air Purifier air220 - Collects Microparticles & Smaller, Including Dust, Pollen & Dandruff from Pets FeaturesFor fresh indoor airPrefilters capture large particlesCaptures 99.97% of 0.3 microparticles and smallerReplace filters every six monthsBISSELL® HEPA & pre-filter for BISSELL® air220 Series 3001 for fresh indoor air. Regular maintenance of your air purifier by replacing the filter with a genuine BISSELL® HEPA + pre-filter means that your machine can continue to catch pollen, dust, pet dander, odours and volatile organic compounds in the air. Captures 99.97% of 0.3-micron particles and smaller, including dust, pollen, and dandruff from domestic animals. Prefilters first capture large particles such as hair and pet fur. Medical Grade H13 HEPA filters capture microscopic particles such as dust and allergens, including pollen and dandruff from pets. - Replace filters every six months. Keep your air purifier running in the best way by changing filters regularly.