Abstract: Processing apparatus includes a plurality of processing tanks with a separate film transport and agitating assembly for each tank. Each transport device receives film units, of the type having a plurality of disc-shaped film elements supported in spaced relation on an elongated shaft, and revolves the film units around a central axis, into and out of its processing tank. Each agitating device provides separate drive to rotate the film units on their shaft axes during movement in the tank. Successive transport devices can have different film unit capacities and move the film units at predetermined synchronous rates to facilitate a continuous throughput rate of film units into and out of the apparatus, but allow different processing periods in different processing tanks.