200. While circulating heated sulfuric acid through a feed water heater of a flash evaporator for the purposes of scale removal, what would be the indication of the continued presence of scale?

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change in color (turning to orange with a ph of 4.0) and continued venting of carbon dioxide gas.

200. While circulating heated sulfuric acid through a feed water heater of a flash evaporator for the purposes of scale removal, what would be the indication of the continued presence of scale?

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