What Is the Difference Between a Diaphragm and a Peristaltic Dosing Pump?

A diaphragm pump like the Pulsafeeder Pulsatron C Series LC54SA-VHC1-XXX uses a positive displacement diaphragm driven by an electronic solenoid. The pump does not use a motor with a cooling fan. Because of this design, the housing stays fully enclosed and works well outdoors.

A manual stroke length knob lets you adjust flow down to 20% of maximum output. Higher-end models also include a stroke frequency control. This feature slows the stroke rate for finer adjustment. When you combine both controls, you can reduce output to nearly 1%. This flexibility helps when applications require precise chemical dosing.

The Pulsafeeder pump includes a full 2-year warranty.

Peristaltic pumps, such as the Stenner 85MHP17, offer different advantages. The biggest benefit is reliable self-priming. These pumps do not lose prime. This feature is critical when feeding chlorine or other gaseous chemicals.

Air bubbles do not interrupt performance. The pump simply pushes them through the line.

The system uses a flexible tube positioned between three rollers inside the pump head. A motor rotates the rollers. As they turn, they compress the tube and move the chemical forward, including any trapped air. This design keeps dosing consistent.

You typically replace the tube once per year, depending on use and chemical type. Stenner pumps include a 1-year warranty.

Both Pulsafeeder and Stenner pumps deliver excellent quality and reliability. Milton Roy LMI pumps also perform at a high level. Each manufacturer supports their products and responds quickly to service needs.

We have sold these pumps for over 22 years. They continue to prove themselves in demanding water treatment applications.