I. economic principles: according to characteristics such as density, viscosity, corrosivity, choose the most appropriate type of pump materials and most suitable pump, then make sure the using life of the pump.
II. principles of efficiency: try to choose a high power water pumps, used as far as possible in the function parameters for large pump because pump higher than the smaller pump power.
III. principles of energy saving: try to get in or near the rated operating conditions of the pump case using, which can forward pump power. In addition to pump at work should be fully taken into account, to make the pump under the phenomenon persisted in efficient.