Disclosed herein is an impeller for mixing a fluid wherein the impeller is fashioned so as to substantially reduce areas of fluid acceleration and deceleration around a hub region of the impeller during fluid mixing. The impeller has a generally circularly shaped hub having a downwardly directed progressively tapered volume which has plurality of periods formed therein corresponding to the number of increasingly arced blades. Each of the increasingly arced blades flare outwards to a distal end region of the impeller and have an increasing radius to said arc towards a peripheral edge region of said hub. The flare to the increasingly arced blades defines a larger circumference than that of said hub, thereby imparting a generally frusto-concial shape to the impeller. A method mixing a fluid using the impeller disclosed herein is also disclosed.
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