The difference is that the pressure required to force the viscous liquid through the discharge hose would have to be greater. More pressure means the engine has to deliver more horsepower. Output reduces when using these high concentrations of polymer because the amount entering the pump suction is reduced. Flow rates of water and water-polymer mixture through a given nozzle at a given pressure vary little. Most of the flow reduction is because the pump is starved on the suction side.
Centrifugal spreaders can treat a wide swath when relatively large granules are used.
The rotor that slings the granules is driven by a 12-volt DC motor. Normally, the spreader is purchased as a complete unit except for the mounting system. Because boats used to treat aquatic weeds are normally used to apply both sprays and granular applications from the bow, the spreader is usually mounted so that it can be quickly removed. Blower type spreader for granular aquatic herbicide formulations. An advantage of blower type spreaders is that little dust is created as compared to that created when the mechanical rotor of centrifugal spreaders strikes pellets or granules.