Filtration can remove microorganisms from the liquid.
Drinks such as beer can be sterilized by filtration to avoid quality changes which may impose from treatments such as heat sterilization. The fluid is filter through millipore membrane which has pore diameter (e.g. 2 um) smaller then that of bacteria. Microorganisms can be effectively eliminated with this preservation procedure.
Filtration is used for clearing fluids such as beer.