The Dreame RHF21 is a high-efficiency HEPA filter designed to maintain the air quality and suction power of your robotic vacuum. It effectively captures up to 99% of common airborne particles, including mold, pollen, dust mites, and pet dander, making it a helpful addition for households with allergies or pets. This component is compatible with a wide range of advanced models, including the X50 Ultra, X50 Master, X50 Pro (Ultrathin), X50 Ultra Complete, X50s Ultra, X50s Ultra Complete, L50 Pro Ultra, L50 Ultra, L50s Ultra, L40s Ultra, L40s Pro Ultra, and Matrix10 Ultra. To keep the device running smoothly, you should clean the filter every two weeks and replace it every 3 to 6 months depending on how often you vacuum.