Ultrafiltration is a membrane process with the ability to separate molecules in solution based on size. It is a pressure driven process with a typical nominal pore size of 0.*1 micron (**0, **0MWCO), and configurations are either cross flow or dead end filtration. UF removes bacteria and protozoa, including giardia and cryptosporidium. Reduces turbidity to < 0.1 NTU and removes 6 log of viruses. UF is ideal as pretreatment to reverse osmosis, final treatment in the pharmaceutical industry, and potable water applications for a wide range of feed sources in the municipal market. Hollow fiber multibore membrane is the most resilient and reliable membrane manufactured. It is a type of hollow fiber, internal pressure UF membrane module. Hollow fiber membranes have significant advantages over other types of membranes, including moderate energy requirements, large surface per unit volume, flexibility in operation, and relatively low operating cost. Our hollow fiber UF membranes are made of improved PVC, which is hydrophilic, pollution proof, anti‐acid and anti‐alcohol, and free of dirty block. UF membranes achieve high water productivity under low pressure, thus greatly reducing operating cost. . UF membranes have been successfully used to remove aerosols, colloids and animalcules in water. Under certain water pressures, water and other small molecules permeate the UF membrane while aerosol, colloid, and animalcule particles are blocked on the inner surface of the UF membrane. The tiny aperture in the UF membrane fiber is so small that suspended particles, colloids, bacteria and macromolecular organisms are blocked in water. These blocked substances accumulate on the inner surface of the membrane, so it is necessary to conduct regular back washing and purge these UF membrane modules with chemicals to clean the membrane surface.