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Diatomaceous earth is a naturally occurring sand extracted from the earth. It consists of microscopic skeletons of algae — known as diatoms — that have fossilized over millions of years. There are two main types of diatomaceous earth: food grade, which is suitable for consumption, and filter grade, which is inedible but has many industrial uses. The diatoms in diatomaceous earth are largely made up of a chemical compound called silica. Silica is commonly found in nature as a component of everything from sand and rocks to plants and humans. However, diatomaceous earth is a concentrated source of silica, which makes it unique