I believe after adding numerous compounds from the start of the wine making process there ends up with suspension that is basically elements trying to find themselves. As the elements settle out and drop to the bottom or side of carboy or bottle the flavor of the original grape reappears.
I have experienced a 16th of in inch deep ring around the outside pocket bottom of carboy after 2nd racking and 10 mo in carboy, so you will get 25 bottles out of a 5 gallon container