Carbon filter works using activated granules of charcoal by which odours are extracted through the fans. These are used to remove chlorine, sediment, and volatile organic compounds from water. These remove particle sizes ranging from 0.5 to 50 micrometres, which is used as part of the filter description. This is also based upon flow rate regulation. There are two types of filters, which includes powdered block filters and granular activated filters. They use secondary media, such as silver or KDF-55, which prevents bacteria growth within the filter. It is used in individual homes as point-of-use water filters. It is also used as pre-treatment devices for reverse osmosis systems and as specialized filters designed to remove chlorine-resistant cysts.

Carbon molecular sieves are micro porous materials that are able to discriminate between absorbing molecules on the basis of shape and size and thus can be used in gas separation processes. Carbon molecular sieve is a new-style non-polarity absorbent that can absorb oxygen molecule under normal temperature and swinging pressure. Carbon molecular sieve is widely applied in petroleum chemical industry, metal heat treatment, electron production and keep-fresh of foodstuff.