The Purafilter(tm) from Purafil, Inc./AQF Technologies, LLC (Atlanta/Charlotte, NC) is a new filter which uses potassium permanganate to achieve capacities up to ten times that of activated-carbon-type filters. Multiple chemical filtration media can be added to the matrix to achieve a broad range of gas-phase contaminant removal, according to the manufacturer. Suggested uses include fan filter units, and outside air, and recirculation air applications in semiconductor cleanrooms.