This technology also uses hollow fiber membrane, however, due to its configuration, its main use is in pigment separation, dairy application, dye extraction, oil removal, beverages, pharma etc apart from water pretreatment. Being a finer membrane it also needs some pretreatment such as media filtration for its smoother operation. Similar to Microfiltration this also ensures complete removal of suspended and colloidal impurities as well as bacteria to make the water suitable for drinking applications as well as for RO Pretreatment.

Ultrafiltration is capable of concentrating bacteria, some proteins, some dyes, and constituents that have a larger molecular weight of greater than 10,000 daltons. Ultrafiltration is not much dependent upon the charge of the particle and is more concerned with the size of the particle.

Normally system is PLC based, however, this system require separate pumps to carry out the backwash operations.