On Fri, 16 Jun 2000 09:21:52 -0400 Lee Whiteman <[log in to unmask]>
writes:
> I can fully appreciate your concern about the quality of water. At a
> location that I worked in, our water supply was stopped due to a
> high
> concentration of fecal matter (true). I can only image what the
> ionic
> contamination data would have been if we did not filter the "city"
> water.
>
> Whenever I had the opportunity, I always put a DI water treatment
> system
> upstream of the aqueous cleaning systems. Where I suspected the
> quality of
> the water into the DI water treatment system, I would put carbon
> filters
> upstream of the DI water treatment system. Therefore, I know the
> quality of
> the water going into the aqueous cleaning system. This measure would
> protect
> the aqueous cleaning system's filters, which could then concentrate
> on
> removing the board residues from the water. Even a closed loop
> cleaning
> system's filters would degrade much quicker if the quality of water
> entering
> the system is poor. Like the term, GIGO - Garbage In, Garbage Out.
>
> From reading the E-Mail's from Jean-Francois Bissonnette, Mike
> Fenner, and
> Frank Asbell, I suspect that we all have been burnt from using poor
> water in
> our respective aqueous cleaning processes.
>
> Lee Whiteman
> Senior Manufacturing Engineer
> ACI / EMPF
> Telephone: (610) 362-1200; Ext. 208
> FAX: (610) 362-1290
> E-Mail: [log in to unmask] <mailto:[log in to unmask]>
>
>
> > -----Original Message-----
> > From: TechNet [mailto:[log in to unmask]]On Behalf Of Franklin D
> Asbell
> > Sent: Friday, June 16, 2000 6:57 AM
> > To: [log in to unmask]
> > Subject: [TN] Board cleaning
> >
> >
> > Having been involved in waste treatment in the past, I often
> requested
> > water analysis of the 'city' water pumped in to my facility. In
> that
> > medium size town in Texas, I had seen in the past elements within
> their
> > report that would have violated my discharge permit.
> >
> > Keep in mind the most common chemical used in water treatment is
> > chlorine. Now you clean a board with only 'city' water and you're
> > leaving chlorine in some form all over the blasted thing.
> >
> > So what happens when these chlorine crystals meet up with some
> current
> > and a wee bit of moisture...well they don't sit around talking
> about the
> > good ol days I can tell you that...
> >
> > Just something to think about...
> >
> > Franklin D Asbell
> > Network Circuits, Inc.
> > Irving, Texas
> >
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