What is Backflow?
What is backflow prevention?
Backflow prevention is the term used to refer to the prevention of an unwanted, reverse flow of water from a potentially polluted source back into the drinking water supply.
When does backflow occur?
Backflow occurs because a condition exists in a water supply system that will cause back-siphonage or back-pressure. Back-siphonage can occur on a property through a vacuum created in the water supply system.
An example of back-siphonage would be a pipeline breakage, can occur within properties when high pressure is generated downstream by pumps, thermal expansion or elevation.
Backflow prevention starts within a property boundary by isolating a possible contamination source from the town mains or storage tanks (rainwater tanks) from the tap or appliance.
What is the safeguard to prevent a backflow occurrence?
A correctly selected backflow prevention device (one way valve) will eliminate any risk of contamination of the drinking water supply. Backflow devices are either testable or non-testable types with the selection dependent on the risk associated with the possible contamination.