Abstract
Most of the Romanian treatment stations use surface waters to obtain potable water. Suspensions elimination is achieved though coagulation with aluminium sulphate or with aluminium polyhydroxychloride. These chemical reagents contaminate the potable water with aluminium ions, which may lead to different diseases of the organism. This paper focuses on a comparative assay of different coagulation agents or coagulation/flocculation agents based on laboratory studies or purification stations. In the same time we propose a new ionic polymer as flocculation agent. Keywords: coagulation/flocculation, polyelectrolytes, potable water