Make sure you’re not at risk of contaminating the water supply by taking steps to prevent backflow. Backflow is when anything flows back into the public drinking water supply, causing it to become contaminated. This can happen as a result of either ‘back-siphonage’ or ‘back-pressure’.
There are three ways of reducing the risk of backflow:
Preventing backflow from domestic properties
Preventing backflow from businesses
Preventing backflow within a business premises