Yeah, lots of people use pH to controll the automatic replenishment of
Resist Stripper.  The controllers are pretty inexpensive too, if you get them
from the right vendor.  As a matter of fact I would recomend that you purchase
the controller instead of tieing it in with the chemistry.
     Some vendors (myself included) can get the controllers at discounted
prices and sell them to you at cost if you try out the chemicals.  If you
don't like the way the chemistry performs you switch suppliers, you won't be
tied up with the controller.  Competition is good for the customer!!!

Steve Wentz

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