Sooooo...the local sprinkler world hooked me up with a design that was all poly. I did the installation last fall and being the rookie that I was/am, I covered the lines up before the gray water came back on this spring. Now I'm dealing with leaks in most of the corners of my main line, which is poly. I have about two hundred feet of poly in the main line. First question, should I have put some type of pressure regulator in at the beginning of the line? They didn't put one in the system design, but maybe they should of? Second...do I need to rip that whole main line out and just redo it with pvc? I'm in Utah, so we do have some pretty cold winters. If there's an easier solution to this, I'd prefer it to ripping it out, but I want it done right. The grass is coming in about a week so I need to figure this out definitively. Thanks!