Carbon, as an element has the excellent ability to remove odour, chlorine, heavy metals, pesticides & many organic & industrial chemicals. Carbon filters are constructed using two different ways, namely granular as well as block carbon & come in different micron sizes that produce different filtration abilities. They also come in different sizes ranging from the 9" slimline through to 20" by 4.5" Big blue filters.
Unfortunately, Carbon can be sourced from many sources with some of these, mostly coal-based being inferior in quality. Be sure that you filter that you choose is sourced from high-quality ingredients such as coconut husks. Aussie Water Coolers filters are all sourced from coconut husks.