Japan-imported True HEPA Technology. Ultra-fine Nylon Pre-Filter. High-Grade Granular Activated carbon Filter. Only use genuine Levoit replacement parts to maintain the best performance. Off-brand filters are inconsistent, unreliable, and may damage the air purifier. Buy With Confidence: Filters are sealed to protect their service time. Remove the plastic packaging of the new filters before running the air purifier. Hassle-Free Warranty and Friendly Customer Support Team-Based in California. Explore More Levoit Air Purifiers: Star Product: Core 300-RAC. Small Room: Core Mini. Best Value of Smart Air Purifier: Core 200S. Best Advanced Model For Large Room: Plasma Pro 400S.