On the left is the old filter from last September. Without cigarettes, just pets, exhaust fumes, and dust. Note that I cleaned it with air; it was even worse, but it doesn’t clean because the pollutants soak into the material and it absolutely needs replacing; not even with water does it clean.

An essential device in the urban environment, even if you don’t have respiratory issues; as soon as you close the windows and let it run for a while, you notice the difference.

I got it to remove the smoke from the room when we smoke inside, it does remove it but the filter smells weird after a few days and releases that smell outside. And since I can't change it every week, I have to keep it as long as it continues to collect the smoke, but it doesn't remove the cigarette smell (as I had read in some reviews).

I use it in a 30sqm room with a smoker and open windows, and still the filter gets soaked with cigarette smell almost within the first month

Very good, just when we smoke we need to have the windows open so the smoke can leave, and then use it to clean the space...otherwise the filter itself will smell too

Heavy smoker's smoke and lettuce... The filter was white, now it's dark brown and I'm still at 50%

Very easy replacement. If you see what the old one collects, you will understand that it works.
The Xiaomi App has an indicator for when it needs changing, but it's good to do it before it reaches 10%.

It does its job well. I have to replace the filter every 6 months because I have a cockatiel parrot at home.

It fits just fine. It seems to do the job, but I haven't measured pollutants with any instrument before and after.

Purchased 4 months ago. I usually operate it in automatic mode. Very easy to use. I connected the device to the app - although the only thing the app has been useful for is to see the filter's lifespan. In 4 months, I have used up half - I really smoke a lot! Good price for the replacement - initially, I estimated that with how much I smoke, I would definitely need a filter change in 3 to 4 months.