Abstract: An apparatus and method for mixing a dry chemical contained within a container. A probe is utilized to puncture an opening in the container and thereafter the probe is extended through the opening. A mixture or liquid is directed to and through the probe and, as the liquid or mixture exits the probe, the dry chemical is dissolved and mixed with the liquid or mixture. Thereafter, the resulting mixture gravitates downwardly through the opening in the container to an underlying tank. Associated with the tank is a concentration controller that is operatively connected to a pump that pumps the mixture from the tank to and through the probe. Effectively, the concentration controller periodically activates the pump so as to maintain the concentration level of the mixture in the tank within a pre-selected range.