Dual sink - one with disposal ; one without. Drain without disposal fully clear and drains well. Drain with disposal clogs. Clears when I turned on the disposal. Now, the water does NOT drain even when disposal turned on. I have plunged drain, put ice cubes down drain; put draino down drain; removed plumbing for blockage, found no blockage; looked in the disposal in-line and found no blockage. Not sure what else to do ? Could it simply be a faulty disposal?