I am assuming that you are ...

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I am assuming that you are talking about vacuum pumps on the paper machine.  If you are talking about something in the Kraft Mill itself, then you may be using different types of pumps that I'm not familiar with.

On the paper machine, one big problem with white water will be temperature.  The max temp I've seen for vacuum pump seal water is 32 C.  A 14 C increase in water temperature is not uncommon for the seal water.  For that reason I've only seen fresh water used.  Sometimes, the fresh water is recirculated through a cooling tower to reduce FW usage.  Or, you can use the heated seal water as makeup elsewhere.