I have question here:
Why not put it on the bottom of the empty can and then pour the grain
or beans on it?
For my imagination it would make a lot more sense to put the dry ice
in there first and then fill the grain on top - thus the expanding CO2
really drives out all air. I imagine, that if put on top part of the
air might stay trapped on the bottom of the container, so grain-borne
bugs could still feast for a while till they use up the oxygen (no
idea how long this would take).
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