What is a Backflow, and How Does it Work?

A backflow is a flow of water or other fluid substances opposite the intended flow. It occurs when the pressure of the fluid in one pipe or vessel becomes more significant than the pressure of fluid in another pipe or vessel, causing a reversal of the normal flow.
There are many potential causes of backflows, but some common ones include defective valves, improper installation, and blockages in the pipes. Backflows can be dangerous because they can contaminate drinking water supplies with hazardous substances such as chemicals and sewage. They can also cause damage to property and equipment.