Quote Originally Posted by MattKing View Post
The bottom of the tank has figures for how much solution to use with what films (to ensure they are covered by the solution).

It has the numbers for 1 roll of 35mm or 126 film (375 ml), 2 rolls of 35mm or 126 film (650 ml), 1 roll of 120 or 220 film (590 ml) and 1 roll of 127 film (460 ml).
Some folks put the empty reel in the top position when they are running one roll just to make sure the reel with the film stays in place. The full reel goes in the bottom of course.