Pure food grade. DE is not earth or dirt. It is the fossilized remains of Melorisa Preicelanica, microscopic one-celled aquatic plants. As these diatoms fossilized they retained their tubular shape and holes. Their shape and hardness produces DE that is extremely pure and consistent. This is amorphous silica in its naturally occurring state. It is from one of the four out of 600 DE deposits rated Chemical Codex Food Grade by FDA standards. $3.00 rebate at www.LuminoWellness.com. See Label on Back for Important Information: What are the differences in Food Grade DE; What makes fresh water DE superior to salt water DE; Why amorphous DE is safer than crystalline silica DE. The Diatomaceous Earth people are talking, writing and blogging about. Pure, fresh water, mined, naturally milled and bagged in the United States. It is unheated, amorphous (non-crystalline) silicon dioxide. What Are the Differences in Food Grade DE: Within the Food-Grade classification there is a wide variance in texture, smell and taste. These depend on where it is mined, how it is processed and how finely it is sifted. The FDA has allowed DE for agricultural use since the 1960's. Numerous studies have shown feeding DE results in improved animal health and growth. The recommended amount is 2% dry weight. If mixed with water use one teaspoon with two cups liquid. What Makes Fresh Water DE Superior to Salt Water DE: Salt water deposits contain a mix of diatoms of different shapes. Coming from a variety of water sources these shells are fragile and have broken apart rendering them ineffective. Diatomaceous Earth packaged under the Lumino label comes from extremely pure fresh water deposit. It is almost pure white and contains on average 92% silicon dioxide. Why Amorphous DE is Safer than Crystalline Silica DE: Lumino DE is amorphous silica. This is silica in its naturally occurring state. It is a trace mineral every mammal on the planet needs to survive. The silica in DE becomes crystalline when it is exposed to extreme heat through volcanic activity or commercial manufacturing. Read more about Diatomaceous Earth at www.LuminoWellness.com. We welcome your questions or comments. If you want to use DE as a pesticide/insecticide buy Lumino Diatomaceous Earth for Pets. It is an EPA registered product (EPA No. 87949-I).