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Food-grade diatomaceous earth is the fossilized silica shells of diatoms, ground to a fine powder. The tubular shells with their tiny holes make it abrasive and absorbent, which is why people use it for pantry pest control, as a natural dewormer for pets and livestock, and as a silica supplement. Food grade is the key distinction: it is filtered and low in crystalline silica, unlike the pool-filter grade sold for filtration. It is a plain commodity powder, so value comes from purity and consistent grind rather than features.
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Buyers of food-grade diatomaceous earth generally judge it on fineness, purity and dustiness. Most say it does the job against pantry and garden insects and is easy to mix into feed, while the common complaint is the fine dust and the need to keep it dry.
Diatomaceous Earth (DE) is not earth or dirt. It is made from the fossilized remains of microscopic shells created by one-celled aquatic plants called diatoms.
Over the eons, the diatoms fossilized and kept their tubular shape and holes. Their shape and hardness produce extremely pure and consistent DE.
