Defender Tank Covers from Environetics are custom manufactured from industrial-grade materials to fit the profile of new or existing wastewater treatment or potable water tanks. The covers contain volatile organic compounds at their source. Low-profile structurally supported covers minimize emission treatment volume to reduce the cost of air filtration equipment. They can help eliminate the ongoing expense of applying odor control chemicals through atomizers and misters. 815/838-8331; www.environeticsinc.com