Winterizing prevents damage that results when water remains in your pipes and system controls during the winter months. There are two basic methods of winterizing an irrigation system; 1) gravity and 2) “blowing out.” The latter is the preferred process because it guarantees all elimination of water in the system.

Gravity systems require in-line manual drain valves at all low points and a drain sump (gravel bed) at each of these points must be installed. “Blowing out” requires the use of an air compressor (100 – 500 CFM) to push the water through the lines and components, thus eliminating the water from the system. Do not exceed 80 psi when blowing out the water! The compressor hose is connected to a winterization point (quick coupler, hose or special valve) and then air is slowly allowed to flow into the system. Winterization should also include removing or wrapping the back flow device. Turn the controller to “off”, “Rain Off”, or “Stop” and unplug and remove main electrical wires. When blowing out, do not:

• Exceed 80 psi
• Stand over component parts
• Leave compressor unattended
• Blow out system through a pump
• Leave manual drain valves open