We are currently using two  separate SMT600CL DI water cleaners to
remove ionics from printed circuit assemblies after a defluxing operation.
The system is strictly DI water since we are not performing any flux removal
during this process.  After only 6 months of usage we discovered a
Black-Brown-Orange solid particulate being deposited in the wash chamber on
both machines.  Analysis determined the material is Iron Oxide, or more
commonly called "RUST".  It turns out that the heating element used during
the drying cycle has become corroded.  I don't think that I need to tell all
of you how alarming this is, blowing a metallic oxide onto hardware that is
only being put in this machine to remove ionics.  I send this e-mail to the
rest of TechNet to first warn others of a potential design issue with
Aqueous Tech  DI cleaners and secondly to obtain feedback from current users
of their machines to see if others have run into the same problem.  I am
awaiting a written response from aqueous Technologies on what the fix will
be for this problem.

                                Thanks

                                        Tom Long

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