The filter for the air purifier Mi Air Purifier Formaldehyde Filter S1 is an improved version of a replaceable cartridge for an air purifier, which is intended for home, office use. The first two stages of filtration - effectively cope with the removal of large dust particles, purifying the polluted air from volatile harmful particles, and also eliminates unpleasant odors. The third stage of filtration, thanks to an improved formula, eliminates formaldehyde, benzene and many other unsafe compounds that are excessively contained in new furniture.