This is probably a question I've got to ask the TTB (and FDA), but just wanted to float this out here and see if anyone has dealt with anything similar.
I make a spiced honey liqueur (Krupnikas) that uses, among other stuff, lemon and orange zest. This results in quite a bit of pectin precipitating out in the final product. About 10% of the final blend is cloudy with spice particles and pectins. These are quite difficult to filter out. We could use a centrifuge (lots of $$$), or possibly a bag-type or rotary-drum filter, but all of those are scaled for operations larger than mine right now.