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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.
Since the top of the soil stack is open to the air, it is a neutral pressure system. The air pressure inside the pipes is the same as the air pressure outside. This allows the solids and gasses to move in separate directions without creating a suction or siphon effect.