Changes

:Sewage is '''treated''' in several stages to make it safe to be released into the environment::#[[Filtration]] - A metal grill with large holes is used to collect large [[object]]s that have made their way into sewage.:#[[Sedimentation]] - Sediment is allowed to fall to the bottom of a container and is removed.:#Digestion - [[Micro-organism]]s are added to the sediment to break down many of the [[chemical]]s into smaller [[soluble]] ones.:#Disinfection - [[Chlorine]] of [[Ultraviolet Light]] is used to kill the [[micro-organism]]s before then being released into rivers or the ocean.:'''Water Treatment''' is important for providing [[Potable Water|potable water]] for [[human]] consumption.==Extra Information=={{#ev:youtube|https://www.youtube.com/watch?v=G244Q4AGJ7U}}