The slowly dissipating single application of SPC on Farm D also provided a temporally consistent dose but the concentration of product was substantially below the target at the inlet and middle sections of the raceway. On farm D paddle wheels were added to the raceway in the third trial, causing the HP concentration to remain higher for longer in this trial and increasing variability between trials.Liquid application of SPC on farm B also provided a spatially and temporally consistent dose throughout the raceway but the dose was substantially lower than the target.