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Protect your main water line from being contaminated by using backflow valves!
A backflow valve is used and installed onto your water pipes to ensure that water only flows in one direction. Backflow tends to occur during heavy rainfall or when there are pressure changes in the pipe, which will lead the water to flow the opposite direction and eventually back into the main line. With a backflow valve, if the water from the sewage line tries to flow back into the water line, it will block the water from going through.