Purestream, Inc. and Purestream / Ecofluid 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 / Ecofluid LLC offers the most Innovative Advanced Biological Treatment solutions available today, The Upflow Sludge Blanket Filtration (USBF) Process, as well as Stainless Steel Mechanical Bar Screens and Stainless Steel Microscreen Drum Filters.