Back in the 1980s I shipped 2-4 five gallon buckets of pollen a day to health food stores overnight on Greyhound busses. I used an old Sears seed cleaner (with custom screens) to clean it although we still needed to go through it by hand.
It was a good money maker but the bees seemed to fixate on pollen and plug everything out with the smaller loads that made it through.
If I did that today would pull the screens more. Maybe one week on and two weeks off, but I needed the money back then and the bees suffered for it.
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