February 19, 2013

Backflow prevention assembly units are used to protect potable water supplies from contamination or pollution due to backflow. In water supply systems, water is normally maintained at a significant pressure to enable water to flow from the tap, shower etc. When pressure fails or is reduced, as may happen if a water main bursts, pipes freeze or there is unexpectedly high demand on the water system, then such reduced pressure in the pipe may allow contaminated water from the ground, from storage or from other sources to be drawn up into the system. Backflow prevention assemblies stop this from happening, however they should be regularly tested and repaired so that they work effectively and do not become blocked.