The filters are quite effective but if you live in a high mold area such as I do then the filter by itself simply cannot keep up with the reproductive rate of the mold. You may have seen this type light in the comb box at the Barber's Shop. They are quite inexpensive. This is the best way to finish mold problems. Coupled with the filters AND the mold light, this should pretty well eliminate any mold problems in your home.
Ozone Generators are available through many allergy resource catalogs and publications.
A good one I use is Adirondack's Home Unit. It can be found in our online wellness store. Journal of Industrial Microbiology, May 1996 Fungal colonization of fiberglass insulation in the air distribution system of a multi-story office building , DG Ahearn, SA Crow, RB Simmons, et.al. Pubished by Elsevier Science B.V., Amsterdam. Expert Panel Report- Guidelines for the Diagnosis and Treatment of Asthma, from the Nathional Heart, Lung, and Blood Institute.