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n.1.The action of a siphon.
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Thus, students often have a difficult time predicting conditions that will result in, or prevent, drinking water hazards from back siphonage or back pressure.
They protect drinking water systems against back pressure, back flow and back siphonage, ensuring compliance with relevant water regulations.
Old water pipe - some in the ground for 50 years or more - is deteriorating, leaking precious drinking water into the ground and allowing back siphonage that often contains dangerous contaminants.