Ultrafiltration (UF) is the separation of macromolecules, fine emulsions, or colloidal material across a semi-permeable membrane, with pore sizes ranging from 0.005mm to 0.1 mm (1,000 to 200,000 Daltons). The removal of this material occurs in a cross-flow filtration process, where the feed and concentrate flows are parallel to the membrane surface and the permeate flow is perpendicular to the membrane surface. Pressure is applied to the feed side of the membrane, forcing the water through the membrane to the permeate side. High turbulent flow minimizes boundary layer fouling and sludge build-up on the membrane surface. Cross flow filtration is ideal for high strength oily wastewaters, high concentration biomasss separation process, and high suspended solids concentration applications such as metal hydroxide separation and concentration processes.