Abstract: A mixing apparatus has a shaft, at least one arm radiating outwardly of the shaft, and a mixing element affixed to the arm away from the shaft. The mixing element has a generally frustoconical member with a wide opening at an end thereof and a narrow opening at an opposite end thereof. The mixing element also includes a throat section of a generally constant diameter connected to the narrow opening of the frustoconical member and a diffuser section having an end affixed to an end of the throat section opposite the frustoconical member. The mixing elements have a longitudinal axis extending at an acute angle to horizontal. A motor is cooperative with the shaft so as to rotate the shaft. Each of the mixing elements includes a Venturi.

Abstract: A nozzle for use with a diffuser has a body with a fluid passageway extending through an interior thereof and having a fluid inlet and a fluid outlet. The body has an end surface formed at the fluid outlet. The body has an orifice formed through the end surface so as to communicate with the fluid passageway. The orifice has a first elliptical portion and a second elliptical portion. The elliptical portions are conjoined so as to communicate therebetween. The elliptical portions have major axes of equal length and minor axes of equal length. The nozzle is placed toward a mixing chamber of a jet pump.