This Levoit replacement filter is designed for the Core 300 air purifier to maintain its peak performance. It features a 3-in-1 HEPA filtration system, including a High-Efficiency Activated Carbon layer and a special filter to neutralize harmful germs and mold spores. The ultra-fine nylon pre-filter captures larger particles like dust, lint, fibers, hair, and pet fur, helping to maximize the filter's lifespan. Replace filters every 6-8 months for optimal air cleaning. Filters are sealed to protect their service life; remove the plastic packaging before use.