Every year, before the first freeze, the ritual of irrigation “blow out” or “fall closing” becomes the priority for all irrigation systems that are in parts of the country where the frost level extends below the depth of the installed piping.
Even if you have drained some water out of the system, the remaining water can freeze, expand and crack the PVC, Copper or Polyethylene piping above and below grade. Water left inside could freeze and rupture the pipe walls. Freezing water in the backflow assembly will damage the internal components and could possibly crack the brass body.
