Question about Xiaomi Mi Air Purifier 3H

Yes, there is!
If you press the button on the display and the button on the back at the same time while the unit is switched off, a menu appears in which you cannot actually do anything. However, one of the displayed items can be changed. If the unit is then disconnected from the power and switched on, the filter shows 100% again. Unfortunately, I don't have a device in front of me to follow the procedure in more detail, but I have now done this several times with different 3h units and, even with exhibitors, always with success. However, you should be aware that deposits do not have to be visible and can still be very harmful. A replacement should therefore be carried out at least once a year and should only be considered if conditions are very good. The purchase of an air purifier always entails follow-up costs - you have to be aware of this when buying.

If the air is clean and the Venti is running at the minimum for the majority of the time, it will calculate this accordingly. This should not be the case after 150 days.

No, but you can simply ignore the message and the device will continue to run perfectly ;)

Hi, the replacement filter costs only 39.99 Xiaomi SCG4021GL, Grey, One Size at Amazon. that makes 0.22 € per day.
if you don't want to spend that on your health, sell the device to the highest bidder or ignore the message that was only
for your own good and do your thing as you think. If you set a reminder on your smartphone and change it after 360 days, it only costs 0.11/day.

Hi, the replacement filter costs only 39.99 Xiaomi SCG4021GL, Grey, One Size at Amazon. that makes 0.22 € per day.
if you don't want to spend that on your health, sell the device to the highest bidder or ignore the message that was only
programmed for your own good and do your thing as you think.