ABSTRACT
Theprincipaldisinfectingagentsusedinwatertreatmentarechlorine, chloramine,chlorinedioxideandozone.Afterapreliminarydiscussionof theirrelativeimportance,thesedisinfectantsaredealtwithinturnwith referencetosuchaspectsashistoricaldevelopment,chemicaland bacteriologicalpropertiesandpracticalapplication.
