Core 300 Replacement Filter for LEVOIT Core 300 and Core 300S Air Purifier 3-in-1 H13 True HEPA Replacement Filter COMPATIBILITY: Core 300 replacement filters Compatible with LEVOIT Core 300 and Core 300S, 3-in-1 Grade True Filter High-Efficiency Activated Carbon, Compare to Part # Core 300-RF._x000D_ 3-STAGE FILTRATION: The Core 300 pet care replacement filter uses 3-In-1 Filtration: Fine preliminary filter blocking large particles; True grade filter absorb fine dust particles, and activated carbon filter absorbs a variety of pungent odors, smoke._x000D_ TRUE FILTER: Core 300s Replacement Filter is made of high grade material which meets the High-Efficiency Particulate Air standard. Absorb 99.9% of airborne particles down to 0.3 microns. You can enjoy fresh air in your home now, making your living space healthier and cleaner._x000D_ REPLACE & INSTALL: High quality replacement filters derived from strict requirements for raw materials and processing of products, provides health protection for you. Easy to replace, the recommended replacement cycle 6-12 months. Our Core 300 Filter replacement is incredibly easy to install, no tools required._x000D_ AFTER SALES SERVICE: The package include 4 True filters. Our customer service is always online and will respond to your message within 24 hours. If you have any problems with the filter, please contact us. No need to worry, leave the rest to us. _x000D_