The BIO-PRO biological odor control system from DUALL, a CECO Environmental Company, can be used to remove H2S and reduce sulfur compound odors. It uses Bio-AirSPHERE media technology, a combination of synthetic and organic medias that provides the proper environment for promoting bacteria growth to eliminate odorous compounds. The system removes more than 99 percent of H2S and more than 90 percent of RSC. Available construction materials include PVC, DUALLast FRP and concrete. 989/725-8184; www.dualldiv.com.