Almost all the countries adding other material to brewing the beer, expect Germany strictly obey the pure law 1516 and only allow to use four raw material water, malt, hop and yeast, no others material. The accessories material mainly means unspecified cereals, carbonhydrate, syrup etc. The purpose

During mashing process, the existence of oxygen is easy to cause mash oxidation, which will make beer color become darker, poor stability of flavor, reduce the decomposition of starch. So we must take effective measures to solve these problems.

There are always all kinds of problems in the process of brewing beer. Especially for those who have just started to make craft beer, when they encounter these problems, the first thing that comes to mind is what is wrong with the beer equipment, but they do not consider whether they have made some