Here are the facts. I replaced a bad water pressure tank (35 gal) and replaced the pressure switch (20/40). Pressure tank was set to 18 psi and pressure gets to just under 40 psi so I adjusted the pressure switch accordingly. We have a deep well jet pump, but not sure how deep the well is. Here is the problem. When the pump turns off and someone takes a shower the pressure drops to 20 and the pump kicks in after about 5 minutes the pump sounds like it cannot draw enough water to maintain the pressure and it drops to almost no pressure. If you turn off the shower and wait a few minutes the pump seems to catch up and build the pressure back up. We are in a mild drought in our area this year and not sure that is the issue. I have watched and read so many things on wells that I am at a point of frustration. Any guidance would be appreciated.