I have a shallow well with 4 points at about 17 ft. I have a check valve right before the intake with a filter after outflow. I turn my centrifugal pump on and let it run for about 5 mins. and get a good 35 gpm. When I turn it off and keep it off for several hours it takes 5 mins again to get the water start flowing again. I need to have immedate flow don't I in order to run sprinklers?