Not sure it's really doing much
Purifier works well at clearing smells from cooking. Not sure how effective it is on allergens and things of that sort.. perhaps time will tell. Sleep mode is excellent as far as noise goes but barely moves air. The middle setting is perfect, highest setting is a bit loud and distracting. Similar to the sounds of a hair dryer at low and high setting. Having used it for a couple of weeks now almost daily, I check the filter frequently for what may be collecting. Not a whole lot and to be honest the filter holes are pretty big for this to effectively be able to capture microscopic particles.
Rating: 3 stars