As we known, the beer basic materials are water, beer hops, yeast, and malt. In this one, yeast decides to beer fermentation type, and in meantime decide beer types. The beer fermentation has two types, one is Top-fermented beers, and another is Bottom-fermented beers.

Maturation techniques vary from brewery to brewery but generally they can be divided into two general schemes for finishing beer after primary fermentation called secondary fermentation and cold storage.

Many homebrewers like to take advantage of a process called “secondary fermentation,” and claim that it improves the quality of their homebrew beer. Secondary fermentation, also known as two-stage fermentation, is simply transferring (“racking”) your homebrew from one fermenter to another. The optim