Recirculation is the process of moving the mash liquid through the grain bed that acts as a filter  to clarify the wort by filtering out the bits and pieces of solids. For home brewers this is usually done by draining a quart of liquid out of the bottom of the mash tun and gently pouring it on top of the mash. For commercial breweries and advanced homebrew setups, pumps are used to re-circulate the wort through the grain bed.

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