Question about Levoit Core Mini

The replacement filter for the Levoit Core Mini air purifier is the Levoit Core Mini True HEPA 3-Stage Original Replacement Filter. This filter provides three-stage filtration that captures at least 97% of airborne particles from 0.3 microns in size. To replace the filter, remove the bottom half of the device, pull out the old filter and insert the new one. Close the appliance again and turn it clockwise to tighten. To reset the filter warning light, press and hold the on/off switch for three seconds.