This was the original thread on RC when I asked the question.
http://www.reefcentral.com/forums/sh....php?t=1623983
I really have no idea how a bucket of salt is produced, but if it all has to be mixed to get all the additives then I can see that being a problem, if one ordered a particular color of paint which came in paint ball size pellets and had to be mixed totally I can see that if a single pellet of black wasn't mixed with the rest of the tub and small portions were mixed frequently then one of the batches of paint is going to be very different.
If however the components in the bucket are a multiple of tiny amounts mixing short batches shouldn't be a problem.
This begs the question, is it OK to split a pail of salt with your friend?