activated alumina

American  

noun

Chemistry.

1. alumina in the form of granules having many fine pores, used to adsorb water and various gases.

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activated alumina British  

noun

1. a granular highly porous and adsorptive form of aluminium oxide, used for drying gases and as an oil-filtering material and catalyst

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Example Sentences

The activated alumina helps them get within the legal limit, but fluoride levels there are still far higher than most other communities in the U.S.

From Salon

In Andrews, Texas — population 13,000 — city leaders recently spent $5.5 million on a facility that removes arsenic and fluoride from the water by running it through a porous material called activated alumina, which strips some of the minerals from the water.

From Salon

Reverse-osmosis filters and carbon filters with activated alumina remove most of the fluoride, but water softeners and charcoal or carbon filters do not.

From New York Times

Mr. Davis thought of an aluminum holder with a filter of activated alumina, an absorbent much used in chemistry.

From Time Magazine Archive