I never let a Indonesian "also called pump specialist" anywhere close to my water supply
The only thing they do (especially when you are not there) brake the thing that was not broken in the 1st place, and then come to the conclusion
that you need a new pump, because it is broken, i have been doing it myself for the last 3years, just have a few hours of work setting up the system.
its all very logic work, but if Indonesian set it up, nothing make sense and becomes very complex!