Abstract: A propeller type fluid mixing apparatus for inducing the flow of a fluid into a liquid being treated by the rotation of a propeller in the liquid comprising a drive shaft supported for rotary motion about its axis having first and second ends; motor connected to a first end of said drive shaft for rotating said drive shaft; a propeller attached to a second end of said drive shaft whereby the rotation of said drive shaft rotates said propeller and induces a flow of the liquid in which the propeller is disposed; at least one conduit attached to said housing, said conduit having an inlet portion and an outlet portion; said outlet portion comprises a diffuser ring said diffuser ring being located a distance upstream of said propeller that is no more than 2 times the outside diameter of the propeller and the effective diameter of the diffuser ring is equal to or less than the outside diameter of the propeller; and said inlet portion of said conduit attached to a pressurized source for said fluid.