We are often ask why a carboy (kar boi) is called a carboy. The word carboy comes from the Persian qarabah, from Arabic qarraba meaning “big jug”.
A carboy is a large container usually made of glass which holds up to 15 gallons for liquids primarily used for transporting fluids including chemicals and water. They are also used in fermenting beer, wine, mead, and cider. In home fermentation, a carboy is also know as a demi-jon. A demi-jon is often encased in a protective basket or crate. Originally these baskets were woven, but today they are usually plastic.