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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