Mash-lauter tun - Beer, Wine, Mead, & Cider Brewing Discussion Community.

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A vessel used to contain grains and water in the process of converting the starches in the grain into sugar (mashing) and separating the wort from the grains (lauter).

For the homebrewer the MLT is most often a converted cooler used to hold the grain and water at mashing temperature but can be a kettle which uses heat to keep the grain/water mixture at temperature. After conversion is complete, the wort is separated from the grains -- a process called lautering.