Which type of pump is typically used for low pump capacity and nonabrasive materials?

The most suitable choice for low pump capacity and nonabrasive materials is a roller pump. Roller pumps function by using rollers that press against a flexible tube, creating a peristaltic action to move fluids. These pumps are primarily designed for handling low flow rates effectively and can manage nonabrasive fluids without damaging the pump components.

Roller pumps are advantageous in applications where gentle handling of nonabrasive materials is necessary, as they minimize shear stress on the fluid. This characteristic makes them particularly useful in various aquatic pest management scenarios where maintaining the integrity of the treated materials is important.

While the other types of pumps can handle various fluid characteristics, they are generally suited for different applications. Piston and diaphragm pumps, for example, can create higher pressures and are better for applications needing more robust performance. Centrifugal pumps are commonly used for higher flow rates and may not perform efficiently at low capacities. Thus, the roller pump stands out as the optimal choice for the specified conditions.