Hello, I have a deep well jet pump that keeps turning on every 30 minutes even when not using water. The jet body was replaced a year ago and everything was ok until about 2 weeks ago. I've had a plumber here twice already. They replaced my pressure seating foot valve with a spring loaded one. then had to replace that one because it was damaged. The strainer was bent. Each time the system seems fine when they leave. I run water from the bottom of the tank for a few hours to get rid of sediment but then after that the pump goes back to turning on every 30 minutes. The tank was tested and is ok. I've isolated the house by closing the ball valve between the tank and house and still loose pressure. The lines going from the house and into the well were pressure checked by the plumber by removing the exsisting pressure gauge on the pump with one with a shrader valve. The ball valve between the pump and tank was closed and then a compressor was hooked up and the lines and pump were pressurized to 90 psi. There wasn't a noticeable pressure drop. Im really not sure where to go from here. Do I have them issolate each line and pressure check them separately? Any help would be appreciated.