Consider the ion exchange softening of water described in Example 11.6. If 0.3 lb of NaCl is required to regenerate the resin lied per 1000 grains of hardness removed, calculate the salt required per million gallons of water softened. Sketch a meq/1 graph for the ion- exchange-softened water. How does finished water from ion exchange softening differ from finished water produced in lime-soda softening?
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