Purestream, Inc. and Purestream ES , LLC lead the way in advanced wastewater treatment equipment. Purestream, Inc. (Founded in 1971) offers standard biological wastewater treatment products, such as Extended Aeration, Sigma Low Speed Surface Aerators, Rotating Biological Contactors (RBC`s) and Sequencing Batch Reactors (SBR`s). Purestream ES, LLC offers the most ...