Negative ions clean the air of particulates like dust, dander and pollen by magnetically attracting to pollutants until these newly-formed larger particles become too heavy to remain in the air you breathe. Surround Air Ionizers continually produce negative ions, so even if one of these fallen particles is kicked up into the air, it is quickly removed again. The most important thing, though, is that they are taken out of the air, preventing you from inhaling them into your lungs, which is how they cause problems. Negative ions also prevent static electricity and energize the air.
But because you need more than negative ions to truly purify the air, Surround Multi-Tech models incorporate a variety of air purification technologies to treat a broad range of pollution, including HEPA and carbon filtration, TiO2 filtration and ultraviolet lamps.
Also see Surround Air Purifier Replacement Filters and Lamps
All Surround Air units include FREE shipping in the Contiguous USA.