I passed along your comments to the homeowners.
I got a note from them this morning saying the pump stopped overnight, and they couldn't get it going again this morning. They called in a plumber today.
Here is the relevant part of the note:
"The plumber says the pump is bad – and possibly the switch on top of the pump and the pressure tank bladder may also be bad. He’s replacing the pump – and we’re putting in a variable pressure system which will replace the pressure tank downstairs with a box on the wall and a regulator in the well that will respond to pressure needs on-demand. Once they get all of that hooked up, they’re going to check for leaks between the well and the house.
We’ll see how this new system works, but this guy’s telling me that we’ll be amazed. He says we’ll get pressure as if we were on city water. He also said that they hit water at 50 feet – maybe less ..."
Then I got this note (after the installation was complete):
"We had everything running in the house at the same time – and the pressure never dropped below 65!"
I asked if the plumber had given an explanation for the air in the system. The homeowner seemed to think the plumber was blaming a bad air bladder in the tank. This didn't make sense to me.
And what is a "variable pressure system"? It sounds like it kicks on the pump whenever water is demanded. It seems like that would be a pump killer. Am I missing something here?
I still don't understand how air was entering the system. And I don't like not understanding things. Any ideas on this?