Harris food-grade diatomaceous earth (DE) is composed of 100% ground freshwater DE, with no additives. The product is made of the naturally occurring fossilized remains of diatoms, a type of algae that forms in freshwater. These remains are ground up into a soft, fine white powder that carry many different uses. It's chemical-free and completely safe to use around children and pets. Harris diatomaceous earth is listed with the organic minerals research institute (OMRI) for organic use. It's mined in Nevada and packaged in Georgia in airtight bags. Included in the bag is a powder duster, allowing for easy application of a fine dusting of powder.
** The 50 lb bag is from a different supplier. It is still food grade but it comes in paper food grade packaging and does not include a duster.