FEATURES * True HEPA Technology: Fine pre-filter, true HEPA filter, and activated carbon filter work together to capture harmful pollutant in indoor air. * High Performance: Day Dawning effortlessly removes airborne particles as small as 0.3 micron, including dust, pollen, pet dander, bacteria, mold spores, smoke, harmful chemicals, and other pollutants, significantly relieve allergic symptoms and improve breathing. * Replacement Alert: When the filter icon lights up, it is a reminder to check and change the air filter, which is supposed to be every 6-8 months depending on its condition. To reset the replacement alert, please press and hold the filter button for 5 seconds to reset the reminder. * Easy Replacement: all in one design eases your maintenance and replacement. Unwrap the package and put it in your air purifier. No additional tools required. WHEN? * It is recommended to replace the air filter every 6–8 months for optimal use, depending on the status of the filter. * When the replacement icon lights up, it is a reminder to check and change the air filter. HOW? * Rotate the bottom cover counterclockwise and remove the filter * Remove the plastic seal from the filter * Place the filter back into the unit. Make sure the tag of the filter is facing outward. Close the bottom cover by rotating it clockwise. Frequently Asked Questions * What's a True HEPA Filter? HEPA stands for High-Efficiency Particulate Air. HEPA filters, originally designed by the U.S. Army to remove radioactive materials from the air, are the most effective way to remove pollen, dust, and other indoor particle pollutants. A True HEPA filter can remove 99.97% of airborne particles 0.3 microns or larger-- that's 166 times smaller than a human hair. Sometimes, you may see some filters named HEPA-like or HEPA-style, or HEPA-type. Unlike true HEPA filters, these filters cannot actually remove 99.97% of bacteria down to 0.3 microns in diameter. * What’s the difference between HEPA and Medical Grade HEPA Filter? Generally speaking, the higher the HEPA filter grade, the better the purification effect. True HEPA filters usually range from H10-H12. And the highest grade of HEPA filter is H13-H14, which is considered to be medical grade. A normal HEPA filter (H10-H12) removes 99.97% of particles that are 0.3 microns or larger while a medical grade HEPA filter removes 99.97% of particles that are 0.1 microns or larger. If you need the Medical Grade H13 filter, please click here to learn more: https://airthereal.