In the garage after the German experiment
Without going into the details of semiconductor physics, magic devaysa described can be explained as follows: under the action of ultraviolet light on the titanium oxide on the surface of the filter is an incredible way to form clusters of oxygen ions O-and OH-radicals, which directly oxidize any organic material with which they interact ( some inorganic compounds also will not be able to survive the ravages of the particles). Impurities do not accumulate in the filter, and ultraviolet radiation in the presence of the photocatalyst to decompose completely harmless components of the natural air environment.
Destroyed particle size — 0.001 microns — this value is comparable with the size of viruses and molecules is the physical minimum that can be achieved in principle. Small household filter manages an hour filter 100 cubic meters, killing the 94-96% of the dust to 4 microns and 99% of the dust is larger than 4 microns.