Abstract: A mixing device is disclosed for intermixing a plurality of fluids. The mixing device comprises a housing having a cylindrical bore through which the fluids may flow and a diffuser link supported centrally within the housing bore. A right-hand helical baffle is secured to one end of the diffuser link and a left-hand helical baffle secured to the other end of the link. An annulus is rigidly mounted to the housing within the bore with a set of twisted interwoven leaves projecting inwardly from the annulus towards the bore axis. A tube is secured to one of the helical baffles traversing the housing bore and having two slots disposed within the bore through which trace additives may be introduced into the mixing device.