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Lumino Diatomaceous Fresh Water Pure Food GradeIt is the fossilized remains of microscopic shells created by one-celled aquatic plants (diatoms). Over the eons, as these diatoms fossilized, they retained their tubular shape and holes. Their shape and hardness produce extremely pure and consistent DE. There are different grades of DE in the marketplace. Of the 600 deposits in the U.S., only four are considered Food-Grade by the FDA. Lumino DE is almost pure white and consists of 89-94% silicon...