One of the best fermentation vessels for mash is a winemaking container. These are graduated from 1-30 litres (or in pints and gallons) and the graduation is very useful. The lid is removable so that sugar can be dissolved directly in the water. The vessel is wide at the top so that the carbon dioxide leaves at the widest point, which speeds up fermentation. Such vessels are very easy to keep clean.
The next most useful type is a polythene container (a water container of the type used for camping) in white and approved for containing foodstuffs. This type of container is easier to handle than a glass demijohn and is much less fragile.
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