Membranes with a pore size of 0.1 – 10 µm perform Micro Filtration. Micro Filtration membranes remove all bacteria. However, only part of the viral contamination is caught up in the process, even though viruses are smaller than the pores of a Micro Filtration membrane. This is because viruses can attach themselves to bacterial biofilm. Micro Filtration can be implemented in many different water treatment processes when particles with a diameter greater than 0.1 mm need to be removed from a liquid.
Examples of Micro Filtration applications include separation of oil/ water emulsions, separation of bacteria from water, pretreatment for RO, etc.