Start with the end goal.  ...

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Start with the end goal.  Define the following: Steam Pressure?  Steam Quality?  Steam Purity?  Steam Quantity?  This will establish the Boiler Feedwater purity and thus the Boiler Feedwater Makeup purity.  Once known, compare from an economic and environmental perspective considering both capital and operating costs.  I have authored a paper that might help - since made into a Technical Information Paper by the Technical Association of Pulp and Paper Industry (TAPPI).  Go to TAPPI.org and search for "Design Engineers Decisions Tree: Boiler Feedwater Makeup in the Paper Industry."