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The chlorine dioxide solution must be distributed in the water to be treated as soon as the solution has been prepared to avoid any emissions of chlorine dioxide gas and to prevent the product breaking down in the water to form chlorite and chlorate. It is injected in the water in the same way as chlorine solutions. The same precautions apply as in the case of chlorine to obtain a thorough mixing and to avoid short-circuits in the reactor. The sizing principles for the contact tanks are identical to those for chlorine.

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