A carbon dioxide source tablet is disclosed including a body comprising carbon dioxide source reactable with liquid to produce carbon dioxide gas. The body includes a top side opposite a bottom side, and one or more peripheral sides extending between the top side and the bottom side. The body also includes at least one channel. Each channel extends along one of the top side and the bottom side. Each channel extends in length from a first channel end to a second channel end. Each first and second channel end is located at one of the peripheral sides. Each channel, between its first and second channel ends, is spaced from the peripheral sides. Each channel provides a frangible line of weakness. At least a portion of each channel extends linearly from the channels first channel end to the channels second channel end. A beverage carbonating system is also disclosed.
