To all,
     I've seen Rudy cross the line in the past, but not for a while, and not
this time.  He really does have a lot of knowledge and is a great resource
for everyone to have access to.
He just happens to sell chemicals for a living just like myself and many
others, and his chemicals don't suck, I've used them in the past, they work
fine.  Of course a heck of a lot of other vendors chemicals also work fine
including mine.
     However I have a different opinion on feed and bleed being good for the
vendor and expensive for the PCB shop.  First of all be very careful when you
start thinking you can legally dump something straight out to the drain as
Rudy suggests.  There are very strict laws defining what's legal and what's
not and if you don't stay on top of them you can find yourself not saving
money but losing a hell of a lot of it.  In my area of California the
discharge limit for copper is usually around.4ppm, if you achieve that by way
of dilution you are breaking the law, the same goes with pH.  I won't bore
you with the details.
     The feed and bleed can also be an advantage when it comes to treating a
spent resist stripper bath, you never have one, so you won't be treating it
anymore.
     Also the needs from shop to shop vary, when you get into a more
production orientated shop or high end stuff the need for consistent
operating parameters is very necessary.  The best way you can maintain solid
operating procedures (in a conveyorized stripper) is to have the bath at the
same strength at all times, maintaining the same settings on a day to day
basis, eliminating scrap and saving money with better first pass yields.
Many vendors have reasonable pricing structures that will include controllers
and actually save you money in the long run, if you look at the whole picture.

Steve Wentz
Florida CirTech Inc.
VM# 408-233-0443

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