1.PERFECT FIT: Compatible with LEVOIT Vital 100 air purifier and VAVA 3-in-1 VA-EE004 air purifier 2.3-STAGE FILTRATION: Pre-filter traps hair, pet fur and lint. Advanced activated carbon filter absorbs pet, cooking, and smoke odors. H13 True HEPA filter captures pollen, dust and pet dander. The carbon particles in our product are made from FSC-certified charcoal powder 3.COST-EFFECTIVE: Package includes 2 HEPA filter and 4 replaceable pre-filters. The washable preliminary filter helps to extend the life of the True HEPA filter making it more affordable for you to buy and replace 4.OPTIMAL REPLACEMENT SCHEDULE: To keep your air purifier at peak performance, we recommend replacing the pre-filter every 3 months and the HEPA filter every 6-8 months, depending on the air quality in your area and the use of the air purifier