Defender Tank Covers from Environetics are constructed from structural aluminum frames with integrated reinforced geomembrane cover panels 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 and eliminate UV light penetration to prohibit algae growth. They eliminate the ongoing expense of applying costly odor control chemicals through atomizer and misters. They install quickly and easily. 815/838-8331; www.environeticsinc.com.