[typh00n]

Yes, I own three of those but an earlier version (2) that comes without RFID sensor. And I use the filter waaaaay longer than the device wants me to. This DRM is just milking money out of the consumer and producing waste, nothing else.

My eyes can probably not tell if the filter is over its lifespan, but my pollen allergy definetly can tell if it still works.

[graphe]

They makes sense. Have you considered using another filter? A box fan with a hepa filter or one that has appropriate sized holes may even work better for pollen and also be washable by default. Did you want the smarts in it if any? I'm hooking a plantower sensor to a purifier or you can use the Ikea air quality detector to smart trigger it. https://esphome.io/components/sensor/pm1006.html