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Bottle conditioned beer are usually carbonated entirely via this method, as opposed to filtered beers which are usually carbonated using high pressure gas injection.

Filtered beer tends to have a relatively short Shelf Life , rarely more than a year, as many compounds in the sterile beverage break down into unpleasant tasting ones. Live yeast inside the bottle acts against these processes, giving the beverage a much longer shelf life. A good bottle conditioned beer can maintain its drinkability for many years, and some can be aged for decades.

Bottle conditioned beers vary in clarity. If the yeast remains in suspension, the drink can appear murky or even chunky. But if the yeast is dense and settles, the drink can be completely transparent with only a thin yeast layer at the bottom. The yeast solids are usually referred to as the ''sediment'' or ''dregs'', especially once opened.

Serving such a beverage involves either Decanting the drink into the serving glass, leaving the sediment behind in the bottle, or pouring all the contents into the glass, including sediment, to be drunk together. This is generally a matter of personal preference, though sometimes the brewer will suggest a preferred method for a particular beer. Drinking the sediment has some nutritional benefits, but the flavour and texture of the drink will be slightly changed (often for the better). In some beer cultures, it's common to pour the sediment into its own Shot Glass to be drunk separately.

Bottle conditioned beers are never Pasteurized . Thus they generally contain some live yeast. Homebrewers sometimes take advantage of this by cultivating the yeast from famous beers to use in their own brewing. Some beers, however, use a different strain of yeast for bottling, which in effect contaminates the primary yeast that gives the beer its character.


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