We installed a system a few weeks ago that is having some odd issues. The pump outputs about 15 GPM. The issue is (I believe) that the pressure switch is set totally wrong. At the moment, the switch kicks the pump on at 30 PSI, and kills the pump at 120 PSI. I usually set them for 70/30, so I was really surprised when I got a 120 PSI pressure reading when I went to nozzle up the heads. There is a 300 gallon pressure tank. The issue is that if the pump is off, there is no way the heads use enough water to bring the pressure back down, I have to open a outside hydrant for around 5 minutes before the pump kicks on again. I'm pretty sure that if I reset the pressure switch to a smaller gap between starting and stopping settings the problem will go away, but I thought I'd post it on here, I couldn't get to the switch today as it was in a locked garage. Complicating things is the fact that the well pumps tons of sediment (we installed a filter on our lines), the 1" service line to the house has an inner diameter of about 1/2" because of buildup. I'm wondering if the pressure switch is so plugged up its making it behave weird. Any ideas?