As a side question on PYROCAT..... The Formulary states that you should use 75mL oer 4x5 negative as a minimum using a JOBO processor. Is this a requirement because of developer exhaustion or some other reason? I ask because I am devleoping some 5x7 negatives for a friend, and using 6 5x7 negatives per run would require around 11x75mL or around 800 mL per run of developer.