While perusing the forum today I came across something that Chuck posted a while back prior to the release of Rittenhouse 21. I've reposted the letter here -- it claims the Rittenhouse 21 to be the first whiskey bottled by Heaven Hill not to be chill filtered. It goes on to describe to effects of chill filtering, which seem to prevent the whiskey from clouding as easily. Having put a bottle of Sam Houston in the freezer a few months ago, I can attest to the fact that it clouds up very very much, to the point of almost being white. I've put other bottles in the freezer to a much less dramatic effect -- does this prove anything? Not really, I guess, but it would seem to support Mr. Zoller's declaration, although I understand it is by no means definitive evidence. I just thought I would share.