Wort Filtration Technology in Beer Brewing Filtration systems are used throughout the brewing process, and most beers sold today are filtered to some extent. At the end of the saccharification process, the excipients have completed the breakdown of their macromolecules. Therefore, wort (a water-soluble extract) and distillers grains (residue, macromolecular proteins, cellulose, fat, etc.) must be separated in the shortest possible time. This separation process is called filtration of the mash.