Xiaomi Smart Air Purifier 4 Pro Filter

Primary Filter 360° large particles blocking: The primary filter provides an initial filtration by filtering dust, hair, fine crumbs among other large particles and is resistant to creases, oil, acids, alkalis and more to ensure a long service life.
Xiaomi’s High Efficiency Filter 99.97% filtration of 0.3μm particles*: The 24000cm² high-efficiency filter* removes PM2.5, pollen etc. to output consistent clean air.
High-quality activated carbon: The 650000mg high-quality activated carbon*, with the sophisticated porous structure and evenly distributed carbon, effectively removes air pollutants and odour that are harmful in your home.
The difference between Xiaomi’s High Efficiency Filter and conventional HEPA Filter: Combining two filter technologies: Electrostatic charge and mechanical filtration, Xiaomi’s High Efficiency Filter media can remove 99.97% of airborne particles of 0.3 micrometers in size and traps dust, PM 2.5, pollen, pet dander, smoke and tiny particles. Compared to a conventional HEPA filter, Xiaomi’s High Efficiency Filter allows the air purifier to generate less noise and consume less energy by allowing more airflow to pass through the filter all the while keeping the same cleaning efficiency.
Just one filter for up to one year’s usage: Although the all-in-one filter is durable, the performance may gradually degrade over time. It is recommended to replace the filter every 6-12 months.
Mi Home/Xiaomi Home app connectivity: You can view the filter usage at any time on the Mi Home/Xiaomi Home app which estimates the filter replacement time based on your use.