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he three most important things for choosing a deep well pump
In order to choose the right well pump, you need to know three important things - (1) information about the well, (2) information about consumption, and (3) preferences, if any, for the technical performance of the pump.

1) Information about the well:
inner diameter (this may vary depending on the depth of the hole)
total depth
flow rate (amount of water that can be obtained from a well in steady consumption mode)
static water level (water level in a borehole when water is not taken from it)
dynamic water level (water level in a well when an amount of water equal to the discharge is taken from it)
All these data are indicated in the deep well passport prepared by the well driller. In cases where you are buying a property with a deep well, find out if it has a passport. If, for some reason, the well passport is not available, we recommend that you contact the drilling companies and find out the cost of obtaining this information and creating a passport.

The location of the borehole and the diameter of the pipeline connecting the borehole to the facility being supplied
2) Information about the water supply facility:
What is the planned water consumption (e.g. single family building)
The highest floor of the building where water consumption devices are located
Distance from the well to the supported object
If the borehole is located lower than the building in the terrain, then the difference in height between the borehole head and the foundations of the building
The diameter of the pipeline from the well to the supplied object (if the pipeline is not laid, then its diameter should be determined according to the planned consumption)
Available voltage and power for the water pump (single phase or three phase)
3) Requirements for technical performance
Based on the above information, you can already choose a water pump that will work according to the intended purpose and according to the water flow rate of the deep well. The choice of pump will be even more appropriate if you inform the seller of your wishes regarding the technical performance of the pump:

Preferred type of control - the downhole pump will work electronically and change power depending on consumption, or it will be turned on / off by a pressure relay signal
Available voltage to operate the pump (single phase or three phase)
Other preferences for the pump, such as casing material, impeller material, etc
If you need to replace a pump that has served its time and you were satisfied with the performance of the previous pump, then to buy a new pump, it will be enough if you tell us the diameter of the existing pump (mm or inches), voltage information (single phase or three phase) and three performance parameters: productivity (l/ min), pressure (bar, m) and, if known, power (kW). This data is usually indicated on the pump nameplate.