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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.
In a siphon, where the pipe goes first upward from the higher container and then downward to the lower container, the weight of water in descending portion of the pipe actually decreases the pressure inside the rising portion of the pipe.