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===About Water Treatment===
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.