what is the lautering tank
The process immediately following the mashing process is lautering. The rich sugary liquid that is created through the mashing process is pumped into the lauter tun where the final extraction of wort from the grains is accomplished. This is a lengthy process that is done in a unique tank called a lauter tun.
Sparging setup. The top vessel contains hot water, which is sprayed over the grain in the middle vessel, draining into the brew kettle at bottom. Lautering is a process in brewing beer in which the mash is separated into the clear liquid wort and the residual grain. Lautering usually consists of 3 steps: mashout, recirculation, and sparging.