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Everything you need to know about finding a Backflow System Plumber

Licensed plumbers in Australia, with backflow prevention accreditation issued by a registered training organisation can inspect, commission and test backflow devices.

What is Backflow

Backflow is the reversal of the normal direction of water flow in your water supply plumbing system. In order to reduce the risk of contamination, it is essential to install a Backflow System (otherwise known as a Backflow Prevention System/Device).

Backflow can only occur when the water delivery main is at a lower pressure than your plumbing system. When pressure is not maintained, the water could be drawn from your property back into the main water supply. Backflow may also occur when your water is accidentally connected to a source of pollution, which could then enter then general water supply.

Causes of Backflow

There are two main causes of backflow: back siphonage and back pressure.

An interruption of water, such as a main break or repair, can lead to reduced pressure in the distribution pipes which results in back siphonage. It is also caused by increased water velocity within the distribution pipes created when there is a large draw on water such as in fire fighting.

Improperly equipped hot water units are one of the main causes of backpressure backflow. When a water system is working under higher pressure than the pressure of within the distribution main, backpressure backflow can occur, causing contaminants to flow from the system into the water supply.

Your plumbing contractor will be able to advise you on the number of different backflow prevention devices available, including a reduced pressure zone device, a registered air gap and a testable double check valve.

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