A process for optimizing the rate of oxidation using halogen, e.g. chlorine donors to prevent the accumulation of undesirable chlorinated by-products. The feed rate of a chlorine donor is controlled for maintaining a desired ORP, the rate of oxidation is sufficient to prevent the accumulation of the...http://www.google.de/patents/US6143184?utm_source=gb-gplus-sharePatent US6143184 - Air and water purification using continuous breakpoint halogenation