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If you've ever received a letter from the city about backflow testing and wondered why they care so much about one device on your water main, here's the short answer: water can flow backwards — and when it does, it can put a whole neighbourhood's drinking water at risk. Your water main is a two-way street. Clean water flows from the city main into your building. But under the right conditions, that flow can reverse. There are two ways this happens: Backsiphonage is when press