Long-lasting filter With a lifespan of up to six months, this high-performance filter is easy to replace and ensures you and your family can enjoy fresher, cleaner air for longer. To ensure your family is breathing clean air, it is important to replace the filter in your Xiaomi Mi Air Purifier every few months. The Xiaomi Mi HEPA Filter is designed to 360° filtrate large particles such as hair and dust, as well as small particles such as pollen, smoke, and PM2.5. Additionally, the activated carbon filter helps to absorb odours, Benzene, Formaldehyde and VOCs. This filter has a lifespan of up to six months.