referinte duium:
http://www.google.ca/search?hl=en&source=hp&q=charcoal filte...
"coal" se foloseste ca atare numai cand este vorba despre descrierea unui strat de filtrare din carbune neactivat, generic.

Distilled alcoholic beverage purification
See also: Lincoln County Process
Activated ***carbon filters*** can be used to filter vodka and whiskey of organic impurities which can affect color, taste, and odor. Passing an organically impure vodka through an activated carbon filter at the proper flow rate will result in vodka with an identical alcohol content and significantly increased organic purity, as judged by odor and taste.
http://www.winemakersupplysite.com/Activated-Carbon-wine-mak...
Cred ca ar trebui pastrat si cuvantul "activated" :
**Activated carbon*** is the form of carbon which has been processed to be extremely porous and used for absorption because of its high degree of micro porosity. ***Activated carbon filtering*** is used to remove contamination and impurities by chemical reaction. The ***activated carbon*** normally activated with positive charge attracts negatively charged contaminants. Activated carbon is normally used for water and air purification.
Din cate am inteles, proprietatile pe care le confera aceasta "activare" sunt cele care ii permit filtrului de carbune sa actioneze ca un purificator.

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Note added at 21 hrs (2010-03-11 06:08:03 GMT)
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sursa:
http://activatedcarbontoday.org/