Patent ID: 8398917

Claim:
A method for reducing biological contamination of indoor air, which method comprises: providing a concentrated salt solution, which is either (i) a brine capable of responding to aeration thereof by a rapid increase of its Redox potential, wherein the rate of said increase is greater than the rate of increase observed for a 45% (w/w) calcium chloride solution subjected to identical aeration conditions; or (ii) a brine which is passed through an electrolytic cell in order to raise its Redox potential, wherein chlorine, hypochlorite and hypochlorous acid are generated in said brine; circulating said concentrated salt solution through a treatment zone; causing a stream of biologically contaminated air to flow through said treatment zone, such that said contaminated air is contacted with said salt solution in said treatment zone; wherein the Redox potential of the concentrated salt solution in the treatment zone is from 200 mV to 370 mV; and withdrawing purified air from said treatment zone.