The link works for me & it looks as if Chivas Brothers have a method of purification that "may" not be traditional. However it also looks that the date of filing is 1983, so if they are using this proces, it's been around for quite some time.
I'll repost the link
P.S. Jojo I've been having problems signing up on this site through the e-mail sent to me, is it possble to resend the email? My user name is the one I used to post this responce.