ENVIRA® E-640 is a bromine-donating compound design for control of planktonic and sessile growth in pulp mills, paper making, and wastewater treatment systems. ENVIRA® E-640 releases two powerful oxidizing hypohalous acids providing superior biocidal effectiveness compared to simple chlorination of water at much lower costs. ENVIRA® E-640 also controls the growth of microorganism in the bulk water and removes existing biofouling from system surfaces.