Ibikoresho byo kugenzura ubuziranenge bw'amazi hakoreshejwe uburyo bwa "chemical oxygen deficiency" (COD) ni ibikoresho by'ingenzi mu kugenzura ubuziranenge bw'amazi binyuze mu gupima ingano ya ogisijeni ikenewe kugira ngo ogisijeni ikoreshwe mu bimera biri mu mazi. Ibi bikoresho bigira uruhare runini mu kugenzura ibidukikije, gutunganya amazi yanduye, no mu nganda zitandukanye ...