At the end of the mashing, it is necessary to separate the aqueous solution of
the extract (wort) from the insoluble fraction called spent grains. For this purpose,
lautering (filtration) is carried out either in lauter tuns or in mash filters of different
constructions. In lauter tuns, the complete separation of extract is achieved
through sparging of the spent grains with water. In mash filter, the extract adsorbed
in spent grains is recovered with the use of filter cloths.