Back siphon definition

Back siphon means the flowing back of used, contaminated, or polluted water, from a plumbing fixture or vessel as a result of negative or subatmospheric pressure within the distribution system.
Back siphon means the flowing back of used, contaminated, or polluted water from a plumbing fixture or vessel into a water supply pipe due to a negative pressure in such pipe. (See “Backflow”)
Back siphon means a situation when the supply line pressure falls to atmospheric pressure or below, thereby creating a vacuum or negative pressure.

More Definitions of Back siphon

Back siphon means the flowing back of used, con­ taminated, or polluted water, from a plumbingfixture or vessel as a. result of negative or subatmospheric pressure within the distribution system.