Deep well submersable chedk valve.

How deep is your well?

Putting a check valve on the system will alleviate the pump turning on and off so frequently, but if the water leaks out of the rest of the piping, you're going to have air coming into the system every time you use water. The amount of course depends on how much pipe is in the well.

This all assuming that you don't have a leak in the line somewhere though. If you install a check valve near the well, that should help you figure out where the problem is.

Sounds like same problem I had.We pulled the pump out of casing and found old steel riser piping rotted out in the first 10 ft out of pump.Pipe looked like someone shot it with bird shot.

the proper way it to pull pump ..check piping,and check valve on pump..may be time to replace ..pump... pending on its age...ben sr