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I searched the web for a deal on a decent air purifier and the Xiaomi 4 Pro seemed to meet all my requirements. The filter size, scheduler and air volume ticked all the boxes. I set it up and thought nothing of it until last week my room was lit with the ‘ 0% remaining ’ replace filter warning. I had set my unit up to disable the LCD so this was an unwelcome surprise. I dismissed the warning by clicking the user button to dismiss the error and 15 minutes later it lit up my room again…
There was nowhere in the app I could disable the warning, having cleaned the filter several times throughout the year I was sure it had at least another 12 months of life left in it. I decided to investigate the nightmare DRM RFID chip that was stuck to the bottom of my filter.