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Several characteristics of stock and water flows to and around a tissue machine are often monitored and are controlled for multiple reasons, including: to ensure a consistent flow of stock to the tissue machine, to optimize runability of the machine and prevent process upsets including sheet breaks, to optimize the efficiency of chemical additives and the results of various processes including refining, to produce a consistent high quality tissue sheet with the desired sheet characteristics. The following characteristics are often monitored: pH, consistency, temperature, fiber size distribution, freeness, and charge demand.