Backflow prevention and cross connection control is an issue that you have to look at when you're considering putting in your own irrigation system. Some of the common backflow prevention devices include pressure vacuum breakers, double check valves, anti-siphon valves, and atmospheric vacuum breakers. Since codes and laws are different in every city, town and municipalty you'll have to check with your local codes to find out which one satisfies the laws and codes in your area. For more information visit http://www.SprinklerDaddy.ca/backflowprevention.html
