Diatomaceous Earth

Diatomaceous earth, also known as diatomite and DE, is the naturally occurring fossilized remains of diatoms—single-celled aquatic algae. It is a near-pure sedimentary deposit consisting almost entirely of silica.

Diatoms will grow in almost any environment that combines water and sunlight, allowing them to be found in both fresh and saltwater. Biologists consider them one of the most important groups of basic organisms; all other aquatic life to some degree depends on them.