Thank you, chengkp75, for the information.
To answer your questions:
1. The door to the cabin was closed (we never leave it open) - the smell was coming from the outside of the ship, not inside the cabin. It was also evident in some areas of the open decks, especially toward the aft portion of the ship.
2. The stuff that being dumped seemed to be coming from the waterline at the starboard side of the ship. We were standing at the very aft of the ship by the Great Outdoors Cafe.
3. Not sure what type of chemicals, but the water had almost chunky white foamy stuff in it, and the brown stuff looked like floating feces.
I'd be happy to share the video with you, send me your email.