Odor Control Covers from Industrial & Environmental Concepts can be designed to be semigas or 100 percent gastight. They are designed with an impermeable flexible membrane to contain odors while still enabling access for equipment maintenance or sampling. The covers are commonly used on sludge/liquid tanks and aerobic and anaerobic systems. The company’s Disinfection Covers block penetrating sunlight and are commonly used over chlorine contact chambers. The result is reduced algae and chlorine loss due to volatilization, which improves disinfection and lessens chlorine demand. Both covers are maintenance-free and long-lasting. 952-829-0731; www.ieccovers.com