The slowly dissipating single application of SPC on Farm D also provided a temporally consistent dose but the concentration of product was substantially below thetarget at the inlet and middle sections of the raceway. On farm Dpaddle 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 dosewas substantially lower than the target.