I guess it's kind of backwards to install a system and then ask questions, but I read lots of threads on here before and during my install which I just completed a few nights ago. I am a homeowner and pretty skilled DIY'er. I decided earlier this year to do an irrigation system after one of the guys that works for me did his place, but was a bit leery of following his approach. My yard is bigger and a lot more complicated than his and I wasn't thrilled with trenching up everything without a bit of professional guidance. I found an experienced company that offered a collaborative DIY program. In hindsight this meant, "we sit on the maxi-sneaker and you do all the work", but I'm OK with that as I learned a lot and got a bit of DIY pride out of it. The system is laid out in 12 zones, 5 front and 7 rear, using Hunter PGP rotors and Hunter Pro Sprays (36 heads in all). The controller is a Hunter ICC and I also added an SRR remote control. Lots of pictures here: The Stig's System Let me say that I have a lot of respect for you guys who do this every day. It's hard work and you earn every bit of the money you make. All told I put about 80 hours into it including lawn repair. The hardest part was all the hand trenching in the utility corridor through the limestone and clay that makes up our area. It was also a huge PITA getting under the sidewalk. Now some questions if I may: * The pro who sat on the maxi-sneaker gave me some nozzle guidelines for the PGP rotors: Red 5 for 90 deg heads (run 15 mins), Red 7 for 180 deg heads (run for 30 mins) and Red 9 for 360 deg heads (run for 45 mins). I have not installed the regular program yet as I am trying to germinate the new seed so am just dampening things every few hours throughout the day. Are those good guidelines? Should I be shooting for an inch a week? Any hints on setting up a good program? * How about low heads? Should I install a check valve to keep the zone from draining out after it turns off? * Any way to extend the range of the SRR? I can't get good coverage in the back yard. * When the system is running, I am hearing a bit of rhythmic pressure fluctuation in the copper and out through the Wilkins 975XL. Is there anything I can install in the system to smooth things out? Thanks very much!