Amazi adasanzwe avuye kubitsa bidasanzwe imyaka miriyoni 70. Inkomoko yacyo ni alkaline nkeya hamwe na pH ya 7.4. Nk’ubushakashatsi bwakozwe, mu myaka 65 ntabwo bwigeze buhura na chimie yo hejuru. Yujuje ubuziranenge bwamazi yumwana kuva hasi. Harimo aside silike idasanzwe. Ifite indangagaciro ya COD yo hasi cyane.