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Diatomaceous earth is a naturally occurring, silica-rich sedimentary rock composed of fossilized diatoms (single-celled algae). It is used in various applications due to its absorbent, abrasive, and filtering properties.
A sedimentary rock consisting of fossilized diatoms.
Insecticide
Filtration aid
Absorbent
Mild abrasive (in toothpaste, skin products)
Animal feed additive
Low. Concerns primarily revolve around potential respiratory irritation from inhaling the powder, especially crystalline silica forms.
Some believe it has health benefits when ingested, such as detoxification or improved digestion (though scientific evidence is limited).
Generally neutral, with sources focusing on its practical applications and chemical properties. Some positive sentiment exists regarding its natural origin and potential as a safer alternative to chemical pesticides.
First described by Kützing as 'Bacillaria paradoxa'.
Used for the first time to filter beer by Albert Mann.
Likely first recognized for its abrasive or absorbent properties in early applications.
Effective as an insecticide by disrupting the exoskeletons of insects.
High porosity makes it an effective filtration medium.
Amorphous silica form is considered relatively safe for ingestion in small quantities, while crystalline silica is a known carcinogen upon inhalation.
Generally recognized as safe (GRAS) for certain uses, but inhalation of crystalline silica forms poses a respiratory hazard.
The safety and efficacy of diatomaceous earth depend heavily on its form (amorphous vs. crystalline silica) and the route of exposure (ingestion vs. inhalation).
Boric acid
Alternative insecticide, particularly for indoor use.
Where to find: Hardware stores, online retailers
Activated charcoal
Alternative filtration medium or absorbent.
Where to find: Water filter suppliers, health food stores
Use a dust mask when handling diatomaceous earth to avoid inhalation.
Choose food-grade diatomaceous earth for internal use.
Avoid products containing high levels of crystalline silica.