Facing some similar issues here with our chokecherry liqueur. We've been able to successfully filter down to 30 microns (in a ghetto cartridge filter setup) but when we try to run it through our plate filter at 27 microns, we get hopelessly plugged up. A very thin slime of what I assume are colloids coats the filter sheets not allowing anything by? We've tried going down to 20 and 15 microns in our cartridge setup but gum those up pretty quick.
Picked up some ultazyme clarification enzyme, but will this not work with alcohol present?
Not much settles out in a bottle and the mouth feel of the liqueur is good, so is 30 micron sufficient filtering for a liqueur?
Sorry to hijack, Brothers, but seemed like a similar problem. Thanks