All persons and entities that directly purchased aluminum sulfate within the United States from any Defendant or any predecessor, subsidiary, or affiliate at any time between January 1, 1997 and July 31, 2010. Excluded from the class are Defendants, any parent, subsidiary or affiliate thereof, and Defendants’ officers, directors and employees

Aluminum Sulfate a chemical compound with the formula Al2(SO4)3. It is soluble in water and is mainly used as a coagulating agent (promoting particle collision by neutralizing charge) in the purification of drinking water[3][4] and waste water treatment plants, and also in paper manufacturing. Aluminium sulfate is used in water purification and as a mordant in dyeing and printing textiles. In water purification, it causes impurities to coagulate into larger particles and then settle to the bottom of the container (or be filtered out) more easily.

Plaintiffs brought this action alleging that the Defendants and their co-conspirators engaged in a continuing contract, combination, and conspiracy to artificially fix, raise, maintain, and/or stabilize the prices of alum within the United States in violation of Section 1 of the Sherman Act. Plaintiffs also allege that the Defendants and their co-conspirators agreed to, and did in fact, restrain trade or commerce by fixing, raising, maintaining and/or stabilizing at artificial and supracompetitive levels, the prices of alum.. Defendants: General Chemical Corporation; General Chemical Performance Products, LLC; GenTek Inc.; Chemtrade Logistics Inc.;

General Chemical Corporation; General Chemical Performance Products, LLC; GenTek Inc.; Chemtrade Logistics Inc.