Diatomaceous Earth is a fossilized deposit of microscopic shells created by one celled plants called Diatoms. These plants inhabit all the waters of the earth, and serve as the basic food for aquatic life, just as grass is the basic food for land animals.
What is Codex or "Food Grade" Diatomaceous Earth?
For additional information, see the Analysis of Fossil Shell Flour.
Perma-Guard diatomaceous earth magnified 7,000 times