Outdoor garden pumps and watering
Suited for outdoor watering applications, waste water transfers and non-clean water movement (like a pond with small debris).
These pumps typically have a different kind of impeller (recessed impeller) that stays out of the pathway of the liquid coming into the pump.
It creates a vortex that in turn creates suction for the water.
These advantage is that any debris in the water won't clog the impeller and will pass harmlessly out of the pump to wherever you are pumping it to.