What is the main characteristic that limits the use of roller pumps in aquatic applications?

The primary limitation of roller pumps in aquatic applications is their inability to produce adequate pressure. Roller pumps operate by using rollers to move fluid through a series of tubes, creating a positive displacement. While they are effective for transferring liquids, they typically do not generate the high pressures necessary for certain applications, such as spraying pesticides effectively at significant distances or overcoming the resistance of certain nozzle types. This characteristic becomes critical in aquatic environments where pressure is often needed to ensure proper pesticide coverage and penetration in various types of vegetation or water conditions.

This limitation makes roller pumps less suitable for applications requiring higher spray pressures, such as treatment of dense aquatic weeds or when there is a need to reach elevated areas above the water surface. Understanding the operational limits of roller pumps is essential for making informed decisions about equipment selection in aquatic pest control scenarios.