In a submersible pump for clear water, the sealed motor rotates the impeller, and the impeller is enclosed in the pump casing. The submersible clear water pump can include an air inlet screen that filters out anything that is too large to pump. As the impeller rotates, pressure pushes the medium into the pump inlet, which accelerates the fluid and forces it into the discharge line. It is important to keep the submersible clear water pumps fully immersed in water during operation because they are not suitable for operation in the air. Since the pump is submerged in water, there is no need to prime the pump and prevent cavitation.
Submersible pumps for clear water should not be confused with jet pumps, which are also used in well applications. The jet pump is a centrifugal pump with a venturi nozzle connected to the discharge port. They operate on the Bernoulli principle, using shrinkage to reduce pressure and provide suction. After the pump is started, the power fluid is pumped through the standard centrifugal pump and into the injector. At the throat of the converging portion of the ejector, the pressurized fluid is ejected at a high speed. This creates a low pressure (vacuum) in the throat that draws the target fluid (from the well or other source) into the nozzle.
Submersible pumps for clear water are used in wells from 25 feet to 400 feet deep. Shallow well jet pumps are used for wells of 25 feet or less, and deep well jet pumps can be used for depths between 25 feet and 110 feet.