Static mixers utilize the momentum forces or viscous forces of a flowing fluid to cause blending of multiple fluid streams. We have been the exclusive manufacturer of Bartlett Engineering static mixers for over 20 years. Their mixers have ranged from simple blending of equal parts of low viscosity fluids, to explosion bonded Inconel (R) clad mixers for high temperature gases with integral spray nozzles. For this application the nozzle sprayer pipe was evaluated for susceptibility to vortex shedding resonance. In other instances our mixer combined a 0.001% side stream into water to be treated.