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By Deb Haines What Exactly is Diatomaceous Earth? Diatoms are single-celled algae that inhabit streams, lakes, oceans and other waterways. Fossilized diatoms, whose cell walls are made of silica, are used to make a fine powder called diatomaceous earth (DE). Food-grade DE is typically used to sprinkle on vegetable and fruit gardens to help preventContinue reading “Diatomaceous Earth (DE)”