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Fill with mercury. The rocks will float to the top then you can just pick them up.
And when it's time to get the mercury out:
How is this practical or safe?
when he claimed it was?
It is practical as rocks should float in mercury and it is safe if you use elemental mercury and don't eat it.
It isn't environmentally fantastic and you would want to remove it with a vacuum trap, which does make it a less than ideal option compared to a shopvac.