Centralised treatment is shared by several households or at the village level and has different options of chemical water disinfection available to them than at the household level. The simplest and most common is through use of chlorine, although chlorine leaves a minor toxic residue, so other methods have been developed. One alternative is ozonation, as it leaves no harmful residues, yet is an expensive system to use. Today, combined systems can be found that use filtration, ozone, and smaller amounts of chlorine. De{{Language-fluoridation is also covered in chemical disinfection, as it affects so much of the population in certain regions and is prevalent in their shared systems.box|english_link=CT - Chemical - general|french_link=CT - Traitement chimique - généralités|spanish_link=Coming soon|hindi_link=Coming soon|malayalam_link=Coming soon|tamil_link=Coming soon | korean_link=Coming soon | chinese_link=Coming soon | indonesian_link=Coming soon | japanese_link=Coming soon}}
Centralised treatment is shared by several households or at the village level and has different options of chemical water disinfection available to them than at the household level. The simplest and most common is through use of chlorine, although chlorine leaves a minor toxic residue, so other methods have been developed. One alternative is ozonation, as it leaves no harmful residues, yet is an expensive system to use. Today, combined systems can be found that use filtration, ozone, and smaller amounts of chlorine. De-fluoridation is also covered in chemical disinfection, as fluoride in water affects so much of the population in certain regions and is prevalent in their shared systems.<small-title /><br><div style=" background-color: #efefef; text-align: center; -moz-border-radius: 2px; -webkit-border-radius: 2px; border: 5px solid #dedede; padding: 5px;" >{|bordercellpadding="15" cellspacing="0" width="100%"
|-
! CT |colspan="5" style="background- Chemicalcolor:#efefef;"|
|-
|style="background:#efefef;"|[[Image:chlorination in piped systems iconChlorination_in_piped small.pngjpg|center|100px|link=http://akvo.org/wiki/index.php/Chlorination_in_piped_systemsChlorination in piped systems]]|style="background:#efefef;"|[[Image:chemical disinfection free chlorine iconFree_chlorine small.pngjpg|center|100px|link=http:Chemical disinfection //akvo.org/wiki/index.php/Chemical_disinfection_/_Free_chlorineFree chlorine]]|style="background:#efefef;"|[[Image:safe_water_systems_icon800px-Setup_of_WATAsol small.pngjpg|center|100px|link=http://akvo.org/wiki/index.php/WATAsolThe WATA device]]|style="background:#efefef;"|[[Image:safe_water_systems_iconChlorine_dispenser small.pngjpg|center|100px|link=http://akvo.org/wiki/index.php/Chlorine_DispenserChlorine Dispenser]]
|-
|[[Imagestyle="background:Chlorination_in_piped small.jpg#efefef;"|<div class="center|150px|link" style=http"width://akvo.org/wiki/index.php/auto; margin-left:auto; margin-right:auto;">[[Chlorination_in_piped_systems|Chlorination in<br> piped systems]]</div>|[[Imagestyle="background:Free_chlorine small.jpg#efefef;"|<div class="center|150px|link" style=http"width://akvo.org/wiki/index.php/auto; margin-left:auto; margin-right:auto;">[[Chemical_disinfection_/_Free_chlorine|Chemical disinfection <br>/ Free chlorine]]</div>|[[Imagestyle="background:800px-Setup_of_WATAsol small.jpg#efefef;"|<div class="center|150px|link" style=http"width://akvo.org/wiki/index.php/WATAsolauto; margin-left:auto; margin-right:auto;">[[The WATA device]]</div>|[[Imagestyle="background:Chlorine_dispenser small.jpg#efefef;"|<div class="center|150px|link" style=http"width://akvo.org/wiki/index.php/Chlorine_Dispenserauto; margin-left:auto; margin-right:auto;">[[Chlorine Dispenser]]</div>
|-
|<div classcolspan="center5" style="width:auto; margin-left:auto; margin-right:auto;">[[Chlorination_in_piped_systems|Chlorination in<br> piped systems]]</div>|<div class="center" style="width:auto; margin-left:auto; margin-right:auto;">[[Chemical_disinfection_/_Free_chlorine|Chemical disinfection <br>/ Free chlorine]]</div>|<div class="center" style="width:auto; marginbackground-leftcolor:auto; margin-right:auto#efefef;">[[WATAsol]]</div>|<div class="center" style="width:auto; margin-left:auto; margin-right:auto;">[[Chlorine Dispenser]]</div>
|-
|[[Image:ozonation icon.png|center|linkcolspan="5" style=http://akvo.org/wiki/index.php/Ozonation]]|[[Image"background-color:de-fluoridation icon.png|center#DEDEDE;"|link=http://akvo.org/wiki/index.php/De-fluoridation]]
|-
|[[Image:Ozone_generator small.jpg|center|150px|linkcolspan="5" style=http"background-color://akvo.org/wiki/index.php/Ozonation]]#efefef;"|[[Image:Defluoridation_unit small.jpg|center|150px|link=http://akvo.org/wiki/index.php/De-fluoridation]]
|-
|style="background:#efefef;"|[[Image:Ozone_generator small.jpg|center|100px|link=Ozonation]]|style="background:#efefef;"|[[Image:Defluoridation_unit small.jpg|center|100px|link=De-fluoridation]]|style="background:#efefef;"|[[Image:plation float small.jpg|center|100px|link=Plation float]]|style="background:#efefef;"||-|style="background:#efefef;"|<div class="center" style="width:auto; margin-left:auto; margin-right:auto;">[[Ozonation]]</div>
|style="background:#efefef;"|<div class="center" style="width:auto; margin-left:auto; margin-right:auto;">[[De-fluoridation]]</div>
|style="background:#efefef;"|<div class="center" style="width:auto; margin-left:auto; margin-right:auto;">[[Plation float]]</div> |style="background:#efefef;"||-|colspan="5" style="background-color:#efefef;"|
|}
</div>
