I use anti-siphon valve and there is no backflow preventer for the sprinkler system.
There is a water pressure regulator to home fixture. But the water pressure to the irrigation system is too high. I talked with two plumbers but they gave me different solutions. I need your advice. Thanks for the help https://picasaweb.google.com/chi.emailbox/PressureRegulator#5862400968264984738 1. relocate the current water pressure regulator before the house shut off valve 2. Install another regulator after the irrigation shut off valve.
