Note the auger above the two mix tanks. It feeds polymer pellets into the mix tanks through two flexible tubes known as a pants chute.
A diverter gate at its entrance is remotely controlled and allows the polymer to be directed to either mix tank.
A box dumper and a hopper appear behind the control panel in this photo. A box of polymer pellets is placed into the hopper using a lift truck.
After the box is opened a hydraulic cylinder tilts it 90 degrees allowing the pellets to empty into the hopper.
Some systems also have a hoist on an overhead rail to place bagged pellets over the hopper.