Which type of pump is the most widely used and is known for being among the least expensive?

The most widely used and least expensive type of pump in many applications is the roller pump. This type of pump operates by using rollers that compress a flexible tube, creating a vacuum that draws liquid into the pump and then pushes it out. Roller pumps are particularly popular for their simplicity, reliability, and low cost, making them accessible for a variety of users, including those in the agricultural and aquatic pest control sectors.

Centrifugal pumps are also widely used but tend to be more expensive, especially when higher capacities or pressures are required. Gear pumps and piston pumps, while effective in certain applications, typically involve more complex mechanisms and can incur higher manufacturing and maintenance costs, leading to less widespread use compared to roller pumps. Roller pumps strike an effective balance between performance and cost, making them a preferred choice for many applications in the aquatic pest control field.