Electrostatic Cleaning Electrostatic cleaner can absorb all kinds of dusts, including micro dust as tiny as 0.0001mm. The tungsten filament in the cleaner releases static electricity to charge all particles positively, then these positively charged particles pass through negatively charged lattice plates. When you clean your air purifier every month, you will be relieved of the dirty particles that otherwise would enter into lungs. You should enjoy this while cleaning those filthy filters. Warranty Warranty covers 3 years from the date of purchase(please keep the warranty card). The repair service is free if damaged in transport or malfunctions occurred due to product design and manufactue. In any other cases, a reasonable cost will be charged.