There are many different reasons to use an eductor, including mixing chemicals, suspending solids, adjusting PH, and sweeping debris or sludge toward a filter intake.
An eductor uses a nozzle to produce a high velocity fluid jet to entrain the liquid surrounding the eductor (fluid can be either a gas or a liquid). The fluid in the nozzle jet and the entrained liquid are forced through a diffuser where the high throughput velocity creates a turbulent flow. The turbulence is very effective at mixing the fluid from the nozzle with the entrained liquid.
BEX technical support team helps customers determine how many of which type are required for specific applications, and can suggest appropriate layout/orientation, pipe size, pump size and basic troubleshooting for their systems.
For more information, download Eductor Operating Principles (pdf)