Bubbling of the gas 44 through the liquid 40 continuously mixes the liquid 40 and the organic materials 42. It is preferable that the gas 44 is dispensed so as to uniformly and substantially agitate and aerate the volume of the liquid 40. Additionally, the gas 44 may assist with the composting process by encouraging and supporting organisms which aid in the composting process by breaking down and decomposing the organic material 42. The gas 44 may be continuously bubbled through the liquid 40 or may be periodically bubbled through the liquid 40.