You are correct, it also has Romicon and Abcor on the front. I searched those as well. Found lots of reviews but no documentation. I reached out to Koch membrane systems but have not heard back yet.
I recently acquired a Koch WF4 crossflow wine filter. Appears to be brand new other then a inch of dust on it. A true Barn Find. I checked it over and it appears to be complete with the exception of an operator's manual. Does anybody have any experience operating one of these? Thanks, Paul.