My well feeding my irrigation was fine yielding 20-25 GPM. All of a sudden one day it dropped to 6 GPM. I have a 60-80 cycle with a 150psi wellxtrol tank. The pressure is the same as it always has been and continues a 2-3 minute cycle on and off. My irrigation guy thinks its a pump issue but I have trouble believing that because we are getting 6 GPM when pressure is full and pump is off. Last month I would get 25 GPM when pump was off, How can pressure be normal and GPM is down so much?