Bio-D Food Grade Diatomaceous Earth (25-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. Great for larger-scale applications, this box includes a handy measuring cup. 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 25-pound box of Bio-D diatomaceous earth.