Active carbon filters

The chemical and physical process of absorption, taking place in the active carbon filters, consists of molecules and ions adhering to the surface of some porous solids.
The active carbon granules obtained from mineral or plant charcoal heated to a high temperature (over 900°C or 1,650°F), have a high internal porosity and the capacity to trap the large organic compound molecules like chlorinated solvents and pesticides. They are effective at eliminating both volatile and non-volatile compounds.
The absorption capacity of the active carbon gradually decreases with use. In the waterworks plants, active carbon lasts from 10 to over 24 months, depending on the concentration of pollutants. Active carbon can be regenerated in special furnaces. After several regeneration cycles, the carbon must be replaced.