Photocatalytic oxidation (PCO) technology uses energy to activate a catalyst, turning moisture into products that continuously clean your space. AOPs are propelled out into your space to hunt down particulates, even the very small ones. At the same time, negative ions go out and charge particles such as dust, pollen and pet dander, causing them to drop out of your breathing space. With reactive surface area more than 16x greater than the competition, Greentech's 750+ Wall Mount continuously purifies your space. The result is the reduction of allergens from pets, pollen, and smoke, as well as odors from mold, mildew, and more. Replaceable PCO Cell and MERV filter +.