Comet borehole pump very strong & durable.
What damage most pump is as a result of inadequate water in the borehole, submersible pumps needs water to cool the pump body without such water damage is guarantee.
Secondly, wrong cable type.
Most people uses the ordinary core electric cable the white type, these types of cables are for temporary usage & can last max of 8 months, buy the blue coated cable they can last for 5 years.
So to install a pump on a borehole which does not have enough water please installed liquid level sensors,
They serves as cut off for pumps or AUTOMATIC PUMP CONTROL SWITCHES.
RUNNING A PUMP WITHOUT WATER IS LIKE driving a car without water in the radiator,surely the head gasket will burn.
And in some instances the whole head will crack due to overheating.