I have 2 xiaomis (work great btw) and 3 extra filters we are just cleaning and rotating the filters, and replacing after a few rotations. They seem to forget th

I have 2 xiaomis (work great btw) and 3 extra filters we are just cleaning and rotating the filters, and replacing after a few rotations. They seem to forget that they already knew a filter after a few changes, plus they also work with 'empty' filters, just a warning on the first start. Obviously they aren't as new, but they still work very well.