Ultrafiltration (UF) is a pressure-driven process that removes emulsified oils, metal hydroxides, colloids, emulsions, dispersed material, suspended solids, and other large molecular weight materials from water and other solutions. UF membranes are characterized by their molecular weight cut-off.

UF excels at the clarification of solutions containing suspended solids, bacteria, and high concentrations of macromolecules, including oil and water, fruit juice, milk and whey, electrocoat paints, pharmaceuticals, poly-vinyl alcohol and indigo, potable water, and tertiary wastewater.

Ultrafiltration excels at separating insoluble components from a waste stream, especially oils, precipitated solids, and colloidal particals. Partially Permeable. Ultrafiltration (UF) is a form of filtration that uses a membrane to separate different fluids or ions. Ultrafiltration will normally separate everything that is not soluble and little or nothing of what is soluble. Ultrafiltration also uses a membrane that is partially permeable to perform the separation, but the membrane's pores are typically much larger than the membranes pores that are used in nanofiltration and reverse osmosis filtration.