Thank you, it works perfectly. The filter didn't even really catch dust when I was supposed to replace it...

Exactly, I can agree 100%, these filters have a filter at the front that holds back dust and hair, what accumulates on it, simply suck it away with the hoover. In our region, these filters can be used for years, so there is no need to buy a new one after the timer has expired. By the way, the latest Generation 4 devices have optimised filters that even officially last longer (Xiaomi is also learning).