The patented Veirsep horizontal flotation system incorporates several unique technologies to separate oil and various other contaminates from produced water and contaminated wastewater streams. Featuring a compact footprint, the unit is fully automated and can be designed to operate in an atmospheric or pressurized condition. The system is comprised of an inlet centrifugal coalescing device (Spiralsep™ system), influent and effluent surge compartments, four flotation chambers, an oil collection weir system, Brise™ DGF pumps for recycling fluid and generating varying micron size air/gas bubbles as well as all required control and operational accessories.