Deep well vacuum pumps are those vacuum pumps in which the jet is located at the bottom of the well.
The maximum depth for deep well vacuum pumps is determined by the inside diameter of and the velocity through the jet. The major advantage of jet pumps for deep well installations is the ability to situate all mechanical parts (e.g. electric/petrol motor, rotating impellers) at the ground surface for easy maintenance. The advent of the electrical submersible pump has partly replaced the need for jet type well pumps, except for driven point wells or surface water intakes.
Deep well vacuum pumps are applied to deep wells. So it is widely used in our daily life.