After the first wort (original wort) is filtered, a certain amount of extract remains in the wort layer. In order to ensure the utilization rate of raw materials, this part of the extract needs to be recovered, and these soluble components can be washed out with hot water. The process is called scouring.

Craft beer is not blindly pursuing new, strange, special and different bottles, but should also focus on the stability of beer quality and the consistency of taste. Among them, the body esters have a weak aroma, uncoordinated and rough taste, etc., which greatly reduces the quality of beer.