Replacement anti-formaldehyde dust filter for all air purifiers from Xiaomi. HEPA filter even for the finest particles. For the Mi Air Purifier Pro H model - a larger filter type! The filter, which is supplied by the 3 best air purifier manufacturers in the USA, combines an aerodynamic 360 ° cylindrical design with a powerful triple filter, which consists of primary, HEPA and activated carbon layers. Easy to use and replace. The balance of performance and quality is what makes My air purifier so efficient. HEPA (High-efficiency Particulate Arrestance) is often used in hospitals and laboratories to filter out micron-sized particles. The Mi Air air purifier uses an ultra-dense Toray PP and PET HEPA filter to capture PM2.5, PM0.3, pollen and other respirable particles, allowing only clean air to pass through. It measures 7.7 m at full extension and effectively filters out 99% of PM0.3 particles and 99.99% of PM2.5 particles. Activated carbon absorbs harmful gases that HEPA cannot filter. Coconut activated carbon Mi Air Purifier is one of the most efficient of its kind. In combination with an antiphaldehyde formulation that effectively absorbs harmful chemicals such as formaldehyde, benzene and ammonia, as well as odors and smoke. Filters that are not replaced in time may not be able to block harmful substances or may cause secondary contamination. Cleaning old filters with water or a vacuum cleaner does not guarantee that the filter will regain its effectiveness. We recommend changing the filters every six months or less, depending on usage. Use the Mi Home app to monitor filter life to alert you when a filter needs to be replaced.