From diatomaceousearthonline, by Max Willbert
Using Diatomaceous Earth with Horses
Diatomaceous earth (DE) is the fossilized remains of tiny algae organisms called diatoms. Mined and milled from lakes and oceans around the world, diatomaceous earth is made mostly of silica, but is also composed of other valuable trace minerals like magnesium, calcium, sodium, and iron. DE’s microscopic structure resembles tiny little scrubbers making it a perfect, natural abrasive and exfoliant as well as an effective internal cleanser.