I know this question is rather generic. Say just general BW C-76 (small tank), C-41 and RA-4 processing (rotary tank/drum) in personal use.
It seems some folks re-use the BW chemicals, even the developers. Then most use the color chemical as a one-shot. The labs do not throw them away, but they replenish the liquid.
Then when you do color test printing, do you pour the chemical back to the main container? Or you throw it away and do not want to cross-contaminate the main bottle for main color printing? With the rotary tank/drum, you do not waste so much chemical.
Maybe I answered my own question?
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