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This siphon effect relies on atmospheric pressure to allow the pressure and pressure potential energy to drop as the water travels upward inside the sealed pipe. But eventually the pressure of the rising water reaches zero and no further reductions in pressure and pressure potential energy are possible.
To ensure that the water seal is maintained, the slope and size of the waste pipe connecting it to the stack pipe depends upon the length of the pipe run, typical figures are: Stack pipes should not be joined into less than 450mm above the bottom of the bend at the bottom on the stack pipe underground.