Bio-D Food Grade Diatomaceous Earth with Pistol Duster (10-Pound Box) Made from the powdered fossilized remains of diatoms, a type of hard-shelled algae, Bio-D is 100% food grade with no chemical additives. Shipped as a dry, white powder, diatomaceous earth (also known as DE) has no shelf life and has a variety of uses around the home, garden, or farm. Compress the duster to dispense even into hard-to-reach spaces. Simply unscrew the cap to add more DE. OMRI listed, Bio-D diatomaceous earth is suitable for use in certified organic farming production, handling, and processing with an approved organic farm plan. This pack contains one 10-pound box of Bio-D diatomaceous earth with pistol duster and measuring cup.