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This review of the status of the ammonia-chlorine process is based upon the operation of seventeen water purification plants in the United States and Canada. Its purpose is not to express the personal opinions of any individual, but rather to determine what has been found to be the true value of the process, and the practical methods adopted for its use and control.Before proceeding, allow me to express the appreciation of the author to the many gentlemen who have, by their complete response, made this review possible.

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