Back flow is the reversal of flow of a liquid, gas, or solid into the clean or portable water supply. Backflow happens due to back pressure or due to back siphoning of the plumbing system. If the water is pure, backflow is not a serious concern. But if the water is contaminated and it contains chemicals and harmful bacteria, backflow can pose serious health and safety hazards.
A backflow preventer is quite effective in preventing this. It helps protect portable water supplies from contamination or pollution due to backflow. A backflow preventer though simple in design is ingenious in its working.
Preventing backflow is essential and your first line of defence is to install a backflow preventer.