3D model of a water treatment plant. Note that although conventional water treatment plants are very good in removing the major debris, sand, ... they are not very good in removing microbial organisms, nor filtering out toxic components (ie arsenic, ...). To remove the microbes, chlorination is used, or (more recently) UV-filters (which are allot more environmentally friendly). To remove toxic components, additional carbon filters need to be placed. Nevertheless, to make potable water, solar water distillation plants or reverse osmosis water treatment plants (to filter water from the sea) are more cost-effective solutions.