water soluble flux in line cleaner water wash

Fellow Techies,

Hopefully, someone can shed some light on my concern about rinsing boards (soldered with water soluble flux) with softened water vs. DI water. 

A board assembly house suggested that it is acceptable to do in-process rinsing using "softened" water (in an in-line cleaner) and save the "DI water" rinse for the FINAL in-line cleaning.  In-process cleaning would be for example after the 1st side is soldered on a double sided board.  Seems like a lot of extra work to me switching from softened to DI water.

Look forward to your comments.

thanks
joe

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