The filter design provides generous venting through Oxidizing/Polishing Media. Oxidation is accomplished with chlorine dioxide technology. Because chlorine dioxide reacts selectively and primarily with only the most offensive odor producing compounds (hydrogen sulfide, organic sulfurs, organic amines) Oxidizing/Polishing Media will normally provide a much longer service life than products such as activated carbon. Unwanted reactions do not occur. Power is not needlessly spent; chlorine dioxide remains available and ready on demand. Polishing is accomplished with Countervailant technology. This technology protects against the escape of malodors which can not be oxidized or readily oxidized. Countervailant technology is complex and broadly useful chemistry. It incorporates polymeric adsorption and electrostatic bonding technologies. Polishing and oxidizing are accomplished simultaneously. The result is safe, extremely effective, broad-spectrum malodor control.