I recently discovered that around a couple of the heads in my system, there is a significant amount of water (almost burying the head entirely) that builds up when that zone is turned off. The zone is made up of 10 spray heads and the one with lots of water is the end head in the zone, where the grade starts to slope downward towards the back yard. My first thought was that it was a problem with the head. I changed the head and that didn't appear to be the problem. All of the heads in the zone w...
