REPLACEMENT FILTER FOR XIAOMI MI SMART AIR PURIFIER 4 PRO TWO FILTRATION TECHNOLOGIES: ELECTROSTATIC CHARGE AND MECHANICAL FILTRATION - XIAOMI HIGH-EFFICIENCY FILTER CAN REMOVE UP TO 99.97% OF 0.3 MICRON PARTICLES IN THE AIR AND ALSO TRAP DUST, PM2.5 PARTICLES, POLLEN, PET DANDRUFF, TOBACCO SMOKE AND TINY PARTICLES.