Profile: Severn Trent Services' EST product line provides the municipal and industrial user with equipment for toxic gas mitigation and other related chemical processes. Severn Trent supplies individual ejector-venturi components as well as completely engineered packages incorporating metal or fiberglass venturis, towers, tanks, pumps, valves, piping, instrumentation, and control panels. The EST venturi products are used to scrub emergency releases of toxic gases such as ammonia, chlorine, and sulfur dioxide as well as process emissions of toxic gases, odors, and particulates. Severn Trent also provides eductors used for conveying solids such as activated carbon and for mixing, blending, and pumping chemical additives such as polymers into water streams.