Noxious gases are generated naturally as part of the biological activity in septic tanks. Puffs of these odorous gases can be vented when liquid levels rise in the tank. Activated carbon filters fitted to these vents will adsorb these odors.
Activated charcoal is good at trapping other carbon-based impurities, as well as other things like chlorine. Many other chemicals are not attracted to carbon at all so they pass through.
An activated charcoal filter will remove certain impurities while ignoring others. It also means that, once all of the bonding sites are filled, an activated charcoal filter stops working. At that point you must replace the filter.
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