Placing Dry Ice in the bottom of a dry food storage container is a very economical way to fumigate and store dry goods for an extended amount of time.

Make sure the Dry Ice is not frost covered, as that will add moisture. Put one quarter pound of Dry Ice per five-gallon storage container in the bottom and then pour in the dry food. As the Dry Ice sublimates it replaces the oxygen in the container with CO2.

Leave the lid on but not tightly sealed until the Dry Ice completely sublimates. (About 5-6 hours) Then snap the lid tight. Without oxygen, neither bugs nor bacteria can grow. This process is good for seeds, grains, legumes, flower, powdered milk, etc.