Microfiltration

Physical process where a fluid is passed through a special pore-sized membrane

Microfiltration is a type of physical filtration process where a contaminated fluid is passed through a special pore-sized membrane filter to separate microorganisms and suspended particles from process liquid. It is commonly used in conjunction with various other separation processes such as ultrafiltration and reverse osmosis to provide a product stream which is free of undesired contaminants.

From Wikipedia, under CC BY-SA. More on occurri.