The Annual FilterQueen Defender Bundle includes: (1) Medi-Filter: The Medi-Filter provides three times better-than-HEPA filtration to reduce pollutants such as dust, dust mites, pollen and mold spores. (2) Enviropure Charcoal Filter Wraps: The Enviropure Charcoal Filter Wrap is made with HEGA (High Efficiency Gas Absorption) material, which is highly effective at reducing pollutants such as tobacco smoke, pet odors and lingering cooking odors. How often to change your filters: Medi-Filter: Change once every year. For best results, change every 6 months for homes with pets or smokers. Enviropure Charcoal Filter Wraps: Change every 3-6 months. For best results, change every 3 months for homes with pets or smokers. To order click below or call (877) 746-6680.