Students' understanding of real analysis

In a straining vat there is provided a perforated bottom and a wort outlet below said bottom. In a straining vat of this type the cooked mash is brought into the vat and is separated in the vat in its two constituents, i.e., draff and wort. The draff are solid constituents which remain on the perforated bottom, whereas the wort passes through the perforated bottom and is withdrawn through the outlet.