The present invention relates to methods and devices for mixing the contents of a mixing container, the device including a container defining a container cavity, the container including a bottom wall supporting a hollow shaft, the shaft supporting an impeller thereon such that the impeller is free to rotate about the shaft, the impeller including a central passageway therethrough for receiving the shaft, the container further including an elongate evacuation tube having a first end positioned within the passageway of the shaft and an opposed second end extending to a port of the container.