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You're telling me! That's why I couldn't figure out why the OP wanted to do this. Makes sense now though, sorry about the side tracking.
Wow I misread that! I thought he was using spent grains! When he said left over from other batches I thought he meant something else.
To those who have done this, what kind of efficiency are we looking at typically? Say you got 75% the first time, what can be expected the second...