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We have hypothesized that because our experimental apparatus is currently limited to generating Poiseuille flows, there are no transverse velocities with respect to the streamlines of the flow strong enough to keep large flocs in suspension once they are large enough to settle out. Therefore, large flocs are settling out on the bottom walls of the tubes where the streamline velocity is at a minimum and where there is are negligible velocities normal to the wall to scour the flocs back towards the center of the pipe.