An air treatment filter element is produced by contacting an adsorbent material selected from zeolite, activated carbon or a combination thereof with a liquid for inhibiting the growth of microorganisms. Additionally, the adsorbent material may include silica gel. Preferably, the liquid includes a fungicide/bacteriocide...http://www.google.de/patents/US4534775?utm_source=gb-gplus-sharePatent US4534775 - Air treatment filter element and air treatment filter
Air treatment filter element and air treatment filter
