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Using the correct amount of chemistry is essential for consistent development with the AGO Film Processor. This article covers the recommended minimum chemical volumes for each Paterson tank size when using the roll agitation method (horizontal agitation).

This table gives the recommended minimum chemical volumes for each Paterson tank when using the AGO Film Processor in the roll agitation method.
It is possible to push the chemical level even lower, but we do not recommend it. Do so at your own risk.
Note
When using the 4x5 reel, the listed chemical volume is mandatory to follow accurately.
Updated on 13 Feb 2026