When you get to an empty keg or cask, your tap starts to spit and spray foam. On long draw beer line runs this can mean that every time you change a cask or keg you will waste over 3 pints of beer. Three pints doesn’t sound a lot, but at, say, £3.50 a pint, that is costing you £10.50 in lost sales every time you change a cask. Obviously, it depends on the length of your beer line, but it could work out at even more.

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