Assertion: filter | /r/MadeOf | charcoal
Facets:
value: as an additional filtration agent
type: MANNER
Source sentences:
text: Filters containing an adsorbent or catalyst such as charcoal (carbon) may also remove odors and gaseous pollutants such as volatile organic compounds or ozone.
text: The filters of some cigarettes, such as Parliament, also contain charcoal as an additional filtration agent.