High Efficiency Replacement True Hepa Filter Set (Photocatalyst Filter/Activated Carbon Filter/True Hepa Filter) | | Compatible With Okaysou Apollo 818 4-In-1 Air Purifier | | H13 True Hepa Capture 99.97% Of Airborne Dusts Pm2.5 Down To 0.3 Microns In Size. Remove Large And Airborne Particles, Including Dust, Common Pollutants ,Activated Carbon Reduce Chemicals Vocs, Tobacco Smoke, Pm2.5,Common Household Bad Smell | | Please Replace Regularly To Keep Your Machine Fresh And Clean. For The Best Performance, Clean The Filter Once A Month With A Soft Brush Gently Or With A Vacuum Cleaner. | | Top-Notch Quality Used For Maximum