Dedicate pump has ~ 25 PSI for sprinkler system. All worked great until 2 weeks ago. Two weeks ago, one zone with small non-rotating heads (1/2 circle), had limited water coming from the heads (5 total heads on zone), i.e., spirting on some of the heads, not enough pressure to push all the heads up and provide adequate coverage. This week, in addition to the one zone, another zone, again with non-rotating heads, has the same problem. The zones with rotating heads seem to be working fine. I found...
