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.
WHAT IS DIATOMACEOUS EARTH? A diatom is a one-celled plant, so tiny that it must be magnified thousands of times to be seen. Diatoms take the minerals out of the water and build a protective shell. As they die, the shells drift to the bottom of the ocean or lake bed and form thick layers of Diatomaceous Earth (DE).