Actually, your purifier is working as it should. The black soot is due to the negatives ions which attach themselves to the smoke/dust/dirt particles in the room and make them drop to floor. If you don't smoke it won't be much of a problem. Some minor residue will be found in and around the unit but this comes about because the negative ions make dust and other particulates fall to the floor. A quick wipe or vacuum easily eliminates this problem. Besides, I would rather have them on the floor than floating around in the air, wouldn't you?
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