The purpose of a backflow prevention device or a backflow preventer is to protect a potable water supply from the potential for pollution or contamination that can be caused by backflow. In a water supply system the water has to be maintained at a specific pressure level in order to allow for the water to flow properly through the tap, but when pressure is reduced or fails completely, contaminated water may be able to flow into the pipe from the ground or from storage, and this can cause contamination. Many things can cause pressure to fail or be reduced, such as a water main burst, frozen pipes or an unexpectedly high water system demand.
Backflow preventers are designed to provide for the prevention of this contamination or pollution of the water supply, most commonly by providing an air gap. Specialized backflow preventer valves can be installed in specific strategic locations in any place where there may be a contamination risk. A plumbing professional can install this type of equipment in any plumbing system once they determine where a potential for contamination may occur. When households or commercial properties are having backflow issues, calling in a professional plumber to take a look at the system is essential.
Backflow Preventers are mandatory between the household water supply and your sprinkler or pool fill pipe.