True HEPA filter to eliminate 99.97% of particles as small as 0.3 microns.
3 stages filtration system: pre-filter, HEPA filter, and activated carbon works together to capture particles and odors in the air.
This is an Anti-Formaldehyde filter
Applicable for Mi air purifier 2, 2H, 2S, Pro, 3.
3~6 month lifetime, which can be checked from Mi Home app