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Coagulants When referring to coagulants, positive ions with high valence are preferred. Generally aluminium and iron are applied, aluminium as Al 2 (SO 4) 3-(aluin) and iron as either FeCl 3 or Fe 2 (SO 4) 3-. One can also apply the relatively
1. Aluminum sulfate (Al 2 (SO 4) 3 or alum): Aluminum sulfate (commonly called alum) is used as a coagulant, causing colloidal particles to clump together and settle out of the water. Alum was once the most common coagulant used in West Virginia
