A recirculation assembly for enhanced mixing in a liquid container, an opening being formed in a top of the container, and said assembly comprising: a pump defining an inlet, an outlet and at least one pressurizing device between said inlet and outlet; a fluid-recirculating system cooperative with said pump and comprising conduit defining first and second flowpaths wherein said first flowpath includes an eductor fluidly cooperative therewith, said fluid-recirculating system being configured such that, upon operation of said pump and receipt of liquid that is resident within said container into said first flowpath, recirculating liquid passing through said eductor causes an adjacent portion of said resident liquid to be drawn therein to increase output of said recirculating liquid therefrom, and further wherein said second flowpath is configured to be fluidly cooperative with said first flowpath such that air withdrawn from a volumetric region within said container is combined with said recirculating liquid upstream of said pump inlet such that upon passage of a mixed phase fluid flow comprising both recirculating air and said recirculating liquid through said at least one pressurizing device and said eductor, said recirculating air forms bubbles that are dispersed within said resident liquid for subsequent upward travel therethrough within said container; characterized in that the pump is a diaphragm pump, and the recirculation assembly comprises a lid coupled to said pump and said fluid-recirculating system and mountable at the opening formed in the top of the container, peripheral tabs being integrally formed as part of said lid to receive fasteners to provide a tamper-resistant coupling between said lid and said container. a pump defining an inlet, an outlet and at least one pressurizing device between said inlet and outlet; a fluid-recirculating system cooperative with said pump and comprising conduit defining first and second flowpaths wherein said first flowpath includes an eductor fluidly cooperative therewith, said fluid-recirculating system being configured such that, upon operation of said pump and receipt of liquid that is resident within said container into said first flowpath, recirculating liquid passing through said eductor causes an adjacent portion of said resident liquid to be drawn therein to increase output of said recirculating liquid therefrom, and further wherein said second flowpath is configured to be fluidly cooperative with said first flowpath such that air withdrawn from a volumetric region within said container is combined with said recirculating liquid upstream of said pump inlet such that upon passage of a mixed phase fluid flow comprising both recirculating air and said recirculating liquid through said at least one pressurizing device and said eductor, said recirculating air forms bubbles that are dispersed within said resident liquid for subsequent upward travel therethrough within said container; characterized in that the pump is a diaphragm pump, and the recirculation assembly comprises a lid coupled to said pump and said fluid-recirculating system and mountable at the opening formed in the top of the container, peripheral tabs being integrally formed as part of said lid to receive fasteners to provide a tamper-resistant coupling between said lid and said container.