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You can remove suspended solids larger than to 0.1 - 1.0 m. It is particularly effective at removing large pathogens such as Giardia or Cryptosporidium. Ultrafiltration is common to use in cases where the concentration of STD is not a problem. This is because the membrane pores are too large to filter out particles as small. Generally used as a pretreatment for systems using much more sensitive membranes, such as reverse osmosis or nanofiltration.

Ultrafiltration It basically used to remove most of the colloidal particles and some major pollutants dissolved (0.01  m). It is useful when you must eliminate most of the colloidal particles (also including pathogens). This system, like microfiltration, has the ability to kill bacteria and viruses and is often used as a pretreatment for other systems. Because colloids are removed, the water, once treated has a negligible turbidity.