Filters for the Smart Air Blast Mini purifiers, the old on the left is black/grey, quite evenly spread, and the left on the right is pure white. You see the different layers of the filters from above. &10;&10;This is a B Corp company that sells neat and no-bullshit devices. Still, too expensive for the masses &10;&10;
https://f2.tchncs.de/media_attachments/files/112/557/478/255/627/980/original/168d80df8b89af03.jpg