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A walnut is the nut of any tree of the genus Juglans, particularly the Persian or English walnut, Juglans regia. Technically a walnut is the seed of a drupe or drupaceous nut, and thus not a true botanical nut. It is used for food after being processed while green for pickled walnuts or after full ripening for its nutmeat. Nutmeat of the eastern black walnut from the Juglans nigra is less commercially available, as are butternut nutmeats from Juglans cinerea. The walnut is nutrient-dense with protein and essential fatty acids.
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Activated alumina is manufactured from aluminum hydroxide by dehydroxylating it in a way that produces a highly porous material; this material can have a surface area significantly over 200 m²/g.

Activated alumina, like most commercial desiccant material, is not harmful to people or the environment. Activated alumina is a porous solid made of aluminum oxide, or Al2O3. Though non-toxic, aluminum oxide is mildly irritating to skin and eyes with too much exposure.

Activated Alumina is highly porous material, which is very suitable for use as a filter of fluoride, arsenic and selenium in drinking water. Activated alumina filters can easily reduce fluoride levels from 10.0 ppm to less than 1.0 ppm.  The amount of fluoride leached from the water being filtered depends on how long the water is actually coming in contact with the alumina filter media. Basically, the more alumina in the filter, the less fluoride will be in the final, filtered water.