The basic concept in use behind most of the polymer injection pumps is to take the rotating mechanical energy that stems from the motor and to turn it into pressure energy from the hydraulic oil, which makes for easier pumping. Of course, it is important to remember that there are a number of different types of injection pumps available, and they many have slightly different mechanisms by which they work. They are able to move and pump a variety of different types of fluids of different viscosity levels.