kieselgur

Kieselgur, also known as diatomaceous earth, is a naturally occurring sedimentary rock composed of fossilized diatoms, which are single-celled algae. The skeletons of these diatoms are primarily made of silica. When these diatoms die, their remains accumulate on the bottom of bodies of water, forming a soft, powdery substance. This substance, when extracted and processed, becomes kieselgur.

The fine, porous structure of kieselgur gives it a high surface area and abrasive qualities. These properties make it useful in a variety of applications. Historically, it has been used as a mild abrasive in polishes and toothpastes, as well as a filtering agent. Its ability to absorb liquids makes it an effective absorbent for spills and in industrial processes.

In agriculture, kieselgur is sometimes used as a natural insecticide. Its sharp, microscopic edges can damage the exoskeletons of insects, leading to dehydration and death. It is also used in animal feed as a source of silica and to help control internal parasites. In food and beverage industries, it serves as a filter aid for clarifying liquids like beer, wine, and oils, removing small particles and impurities. It is important to distinguish between food-grade and industrial-grade kieselgur, as only food-grade is safe for consumption or use in food processing.