Reason and method of no water in deep well pump

Well pump out of the water is too little or inadequate for what reasons? And treatment methods
1, the water is too low
Treatment is based on the depth of the flow of water and pump water requirements, the emergence of the deep-well pump with another series of more pumps, and the appropriate increase in the pump tube and drive shaft.

2, the pump section in the gap is too large
Treatment is to adjust the impeller axial clearance.

3, impeller damage
Treatment is to pump out the pump section to replace the impeller.

Deep-well pump motor is running, the pump is not the reasons for what the water? And treatment methods
1, the water is too low, the pump can not absorb water
Treatment is to increase a pump tube and drive shaft.

2, water network blocking
The treatment is to remove the deep well pump from the well, clear the water network plugging and re-install.

3, the pump section into the deep wells too
The treatment method is to increase the pump section one to two pump tube.

What are the reasons for the lack of deep-well pump head? And treatment methods
1, the pump section in the gap is too large
Treatment is to pump out the pump section, adjust the impeller axial clearance.

2, impeller damage
Treatment is to pump out the pump section, replace the impeller.