First, I agree with everything Rudy Sedlak said about the myth of rinsing 
alkaline vs. acid solutions and am not surprised by his story.

Next, just a few words about rinse quality -- it depends
Depends on incoming water quality and desired end-results
What seems to work the most is to measure the incoming water quality with a 
conductivity meter and then monitor the oxide rinse water until your quality 
is affected such as by low peels.  In other words, impirically  determine 
the rinse water quality control point by trial and error by sneaking up to 
the control point from the clean side.  So first double the conductivity of 
the incoming water as a control point.  If all looks well, double it again 
and so on until you have problems, then back off and zero in on a specific 
point to control water flow that gives you the quality you need.
If you don't want to putz around with a conductivity meter, adjust the flow 
rate of the water and the time it is on until you find a working 
combination.  However, the resolution of the control point will have a 
relatively high error thereby wasting water.  Actually measuring the quality 
somehow will use the water most efficiently.
 ----------

Robert Lundquist
Assistant Director
Minnesota Technical Assistance Program
Suite 207
1313  Fifth St SE
Minneapolis,  MN  55414

Phone: 612-627-4557
 FAX:  612-627-4769

E-Mail:  [log in to unmask]

Check out our Website at www.umn.edu/mntap/

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