Abstract: A method of controlling algae in a municipal water plant including the step of adding an algicide-flocculant solution including 25-50 wt % acidic flocculent, 0-10 wt % polymer flocculant aid, an algicide consisting essentially of copper having a concentration of 0.025-1.275 wt % in the form of a water soluble copper salt, balance water. The algicide-flocculant solution may be added to the water via a clarifier of the water plant, a basin of the water plant, or a mixing chamber. The mixing chamber may be located within the clarifier, adjacent to the basin, or upstream of the clarifier and/or the basin.

Abstract: An algicide-flocculant solution for use in treating raw water in a municipal water plant to control algae, the algicide-flocculant solution including 25-50 wt % of an acidic flocculant, 0-10 wt % of a polymer flocculant aid, an algicide of essentially copper having a concentration of 0.025-1.25 wt % in the form of a water soluble capper salt, and balance water. Uniform mixing of the flocculant into the raw water simultaneously uniformly mixes the algicide of the algicide-flocculant solution into the raw water. The acidic flocculant is preferably aluminium sulfate, iron sulfate, iron chloride or mixtures thereof. The water soluble copper salt is preferably copper sulfate, copper chloride, copper nitrate, copper acetate or mixtures thereof. Moreover, the flocculant aid is a high molecular weight quaternary amine such as diallyldimethylammonium chloride.

Abstract: A water soluble copper salt, preferably cupric sulfate pentahydrate, is mixed with water. A small quantity of an acidic flocculant is added to the copper sulfate solution to acidify the water and promote dissolving of the copper sulfate in the water. A 25-50% water solution of an acidic flocculant, with or without a cationic polymeric flocculant aid, is prepared and pumped into a processing vessel or tank. The acidified copper sulfate solution is added to the tank and mixed with the acidic flocculant. The algicide-flocculant solution is transported to a municipal water plant and added to raw water in the clarifier to drop out particulates in the incoming water and control algae in the clarifier.