This system has been tried a few places in the US, and to my knowledge has
never been successful in the eyes of the shop management.  Notice that I use
a highly qualified phrase, "successful in the eyes of the shop management".

This system is costly, and requires maintainance, and cannot actually allow
true "recycling" of the developer and stripper.  It can certainly extend the
life of the solutions significantly, but it cannot extend them indefinitely.
The solutions (developer and stripper) both pickup contaminants that really
cannot be removed by any filtration, no matter how good, and when these
contaminants build, they cause defects.

I am not actually personally familiar with the performance of the Ultrafilter
system, I am talking from theoretical point of view, but I suspect strongly
that determining when to throw the solutions out, or what level of feed and
bleed to use, would require some rather super-human sort of engineering.

At risk of saying things that I want to be true (because I am a vendor of
developers and strippers), my suspicion is that this is one of those systems
that looks truly spectacular on paper, but getting it to work well in a
production environment might be more trouble than it is worth.

And always remember that free advice is often not worth what you paid for it.

Rudy Sedlak
RD Chemical Company

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