3-STAGE FILTRATION: The H128 replacement filter features a three-stage filtration design. The first pre-filter layer captures large particles such as pet hair and fur. The second stage uses an H13 HEPA filter to capture 99.97% of dust, PM2.5, and airborne particles. The third activated carbon layer helps remove odors, promoting a clean and healthy environment for your family. REPLACEMENT CYCLE: Replacing the filter every 6 months helps maintain optimal air purifier performance and ensures cleaner indoor air. EASY INSTALLATION: Install in a few simple steps: 1. Remove the filter cover 2. Unwrap the new H128 filter 3. Insert the filter into the air purifier 4. Replace the filter cover Color: Black Material: Filter cotton Package Contents: 4 Pack * HEPA Replacement Filter Note: The package includes only the items listed. Other products are not included. Lighting and display settings may cause slight variations in color. Measurement may vary by +/- 1-3 cm.