We just moved into a new apartment and the kitchen has a double sided sink. The water will not drain out of the sink past the opening of the drain(drain on one side and the disposal on the other). When the disposal is turned on water floods into the other side of the sink and the water level eventually reaches equilibrium at a slightly lower level. If I plug the drain side and run the disposal it will eventually drain beyond being visible in the pipe. However the next time water is run into the sink it reaches equilibrium again.
Will upload a video later today.
