The stainless steel, in-line continuous flow cell uniformly processes low-viscosity solutions at rates up to 10 GPH (38 LPH). It can be used to emulsify, disperse, and homog-enize by pumping a solution through a zone of intense ultrasonic activity. The degree of processing is controlled by varying the amplitude of the ultra-sonic horn and the flow rate. Some solutions may require recirculating until the desired results are obtained. The continuous flow attachment incor-porates a cooling jacket through whicha suitable cooling liquid can be circu-lated to retard heat build-up during extended operation. The attachment may also be sealed in a closed system to assure sterile conditions and inhibit contamination when working with infectious materials.