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Electrocoagulation works by passing contaminated water between a pair of electrodes that makeup a cell.  Electrodes are either aluminum or steel, depending on the water being treated.  As water passes between the two electrodes, electricity is conducted through the water and the metal ions are liberated from the surface of the anode (Positive), forming metal hydroxides in solution.  These charged metal hydroxides attach themselves to contaminants in the water and within 30 seconds to 2 minutes after the water exits the cell, coagulation occurs.