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A conical fermenter allows for the fermentation and the aging/storing of the brewing process to occur in the same vessel. The cone bottom collects the sediment which is then easily removed by slowly opening a bottom valve until the liquid runs clear, leaving the beer to age. For this reason they are often referred to as "Uni-Tanks" as opposed to their flat-bottom counterparts that require transferring beer to a secondary conditioning tank to separate the sediment.
Modern commercial conical fermenters have the advantage of being made from stainless steel which can be reused indefinitely, is impregnable to odors and discoloration, and can be sanitized easily. Most jacketed fermenters sit atop legs and thus allow siphoning to occur through gravity. Additionally, yeast can be drawn off at any point during fermenting, to be washed and reused again. These features yield considerable cost and time savings for commercial breweries, as well as faster turn-over rates for batches. Glycol-jacketed fermenters have the added benefit of an efficient cooling system built right into the tank.