Perfect Compatibility: Specifically designed for Core 300 series air purifiers, this replacement filter maintains optimal performance. It matches the for-original in both function and fit, ensuring your air purifier operates efficiently. Advanced 3-Stage Filtration: This filter features a multi-layer system including a Fine Nylon Preliminary Filter, 13 Grade HEPA Filter, and an Activated Carbon Filter. It effectively traps and reduces pollutants, providing cleaner air. High-Efficiency Performance: Captures up to 99.97% of fine particles and allergens as small as 0.3 microns. It also absorbs odors from pets, smoking, and cooking with its activated carbon layer, enhancing your living environment. Optimal Filter Life: To achieve the best air filtration and purification, replace the filter every 6-8 months. The lifespan based on your local air quality and how frequently the air purifier is used. Each filter undergoes rigorous quality inspection to high performance. Colour:White