Question about Xiaomi Mi Air Purifier 3C

Yes no worries, what can filter out particles that are of the size of a bacteria, can also filter out PET hair perfectly fine. Please do not throw away a filter after 180 days (there is a countdown in the app that tells you to buy a new filter), remove the filter and use a vacuum cleaner to remove dust that is on the filter surface. You can use such a filter for a very long time because air pollution is not a huge issue here in Europe. The filter interval countdown is more relevant for the APAC region.