A Grant is a small wort collection vessel, open to the air, placed between the lautering vessel and the wort kettle. The traditional purpose of a grant was threefold:

(a) to avoid a potential vacuum in the lauter or mash/lauter tun during wort pumping for recirculation or filling the kettle, which could seal the mash to the false bottom, thus causing turbid worts or stuck mashes;

(b) to allow the brewer to asses wort clarity and wort flow;

(c) in larger systems with multiple lauter tun outlets, to determine whether all parts of the grain bed flow sufficiently well or require raking or other measures to improve flow-through. The grant thus serves as a flow buffer.

In old tower-style breweries, where brewing vessels are stacked one on top of the other and wort flow is by gravity only, there is, of course, no need for a grant as a vacuum break, but its other uses remain valid.

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