albeit late : at least the models "3H" and "3C", were confirmed at the Mi Store in Wallisellen (Glatt). But the filters are (again) hardly available (in the Stote).

As a stopgap, the dust in the filter can be removed with a hoover, but under no circumstances should the filter be "wet" in the broadest sense (mould formation)...

By the way, the filter is not compatible with the new device generation (as of 02/2022) "4", this was confirmed on request at the oe flagship store !

Is compatible with the Xiaomi Mi Air Purifier 3H

Yes I can confirm, I use it in the Xiaomi Air Purifier Pro