What is backflow?
This happens when the flow of non-potable water is reversed and goes back into the drinking water system. There are two types: backpressure backflow and backsiphonage.
Why is it important to protect against it?It can make drinking water in a public water system or a consumer's water system unsafe to drink. Everyone should take precautions to keep the water supply clean.
What is backpressure backflow?This happens when downstream pressure is greater than the upstream pressure in a water system. This may happen when there's a water main break, fire hydrants are used, or water lines are flushed.
What is backsiphonage?
This is caused when there's negative pressure (aka a vacuum) in a water system. This can happen because of the same reasons as backpressure