One and a half tonnes of grist are transferred to our stainless steel semi-lauter mash tun and three waters are added, each one following at a higher temperature. The waters dissolve the soluble sugars in the grist, creating sugary water called wort. The first two waters produce 7,500 litres of wort, which are transferred to the wooden washbacks. The final water produces very weak, sugary wort, which is retained as the first water of the next mashing. The grist residue, now known as draff, is removed and used as animal feed.