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The main risk associated with using a party pump is that it exposes the beer to oxygen. A party pump relies on atmospheric pressure to push the beer from the keg, which introduces air into the system. This exposure to oxygen can lead to oxidation of the beer, negatively affecting its flavor and aroma. Oxidation can create stale, cardboard-like notes and diminish the beer's overall quality.

While other risks might exist, they do not directly relate to the operation of a party pump in the same way. For example, freezing the beer may occur under specific conditions but is not a direct result of using a party pump; over-carbonation would typically stem from improper keg management rather than the pump itself, and spoilage from bacteria is more likely to occur due to poor sanitation than from the use of a party pump. Thus, the introduction of oxygen is the most significant concern when using this type of dispensing system.