Thanks for tuning in 👍

The pressure tank supplies constant water pressure. Also the tank prevents the well pump from short cycling (On/Off). It is better for a pump to just run. The start and stop is hard on the pump motor and will wear it out faster. Another help from the tank is to reduce water hammer. If the tank bladder fails and the tank becomes water logged (No Air) the pump will start turning on and off constantly, every time a little water is called for. The 2-3 PSI below cut-in is to provide water while the pump is starting - without it, pressure will drop to zero (or very nearly) every time when water runs out but the pump is still spinning.

Do you have a deep well submersible pump, or do you have a different set up. Like a cistern or spring.