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Ahydrostatic loop, though not often used inplumbing practice, is an arrangement of pipes formed into a vertical loop to prevent backflow of water within the plumbingpotable water system. Since asiphon has a maximum height that it can work (about 33 feet), a hydrostatic loop is built higher than 33 feet. There are several ways to prevent siphonage and an undesirable backflow of the water in a plumbing system. The design relies on gravity and atmospheric pressure rather than mechanical devices, making it a passive method of backflow prevention.[1] However, due to its impractical height and space requirements, the hydrostatic loop is rarely used in modern installations, where mechanical backflow preventers or air gaps are preferred.
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