My guess is inadequate rinsing after regenerating the resins. Guess 
what? NaOH + HCl > NaCl + H2O

Brian

On 18/01/2011 21:40, Bev Christian wrote:
> TechNetters,
> I have another different but related misting unit concern.  The water that is supposed to be coming through the misters in my lab is supposed to be DI water, but we are finding, over time, a thin layer of NaCl on equipment situated below the mister and trailing off the farther away one gets. We have definitively IDed the NaCl and we have also used a bottle on a stick to capture the spray from the mister and found NaCl.  We are in the process of tracing back the water source to try and find the point of contamination. Has anyone else ever had this problem?
>
> Bev
> RIM
>
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