I have a well pump just for sprinkler system, nelson brand for about 14 year old last year I winterized myself, and notice zone 5 was not much water coming out. this spring zone 5 has low pressure, although the sprinkler head popped up, and the water can come out, it is no mist at all. I tried to clean the zone 5 valve myself, no use, I can't tell whether the valve is good or not. I also measured the pressure while the zone 5 is on by attaching the pressure meter to the well water faucet outside...
