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 Innovative Advanced Biological Treatment solution available today, The Biologically Engineered Single Sludge Treatment (BESST™) Process, as well as Stainless Steel Mechanical Bar Screens, Stainless Steel Microscreen Drum Filters, Screw Screens, Sand Separators, and Other Fine Products From In-Eko. We are also proud to carry the Sigma Submersible Mixer Line and Gasoline Powered Floating Pumps.