well that may mean its not shot then. Your impeller needs some more work. Check along the magnet, sometimes there are fine cracks along it that you might miss. If there are cracks you can try supergluing it back together but there are no guarantees that that will work or last very long. You may need to buy a new impeller. Did you clean out the impeller chamber with vinegar as well? Try using a toothbrush to scrub it out as calcium deposits may be weaked by the vinegar but not necessarily gone.
Gee do I sound like I have too much experience with this??
