Go to the source to see the experiment notes. After 4 filtrations through the Brita filter, the Vladimir vodka was vastly improved.

i think they proved this wrong on mythbusters... i dont remeber though im looking it up now

Oooh, we were just talking last night about how the Mythbusters should do this on the show. Please let me know what you find.

Here's one I've read a lot about lately: can filtration make crappy vodka top shelf quality? Busted. The MythBusters try filtering some rotgut through a Brita filter several times, and though it makes the vodka better, top shelf beats it out.

Source here.

Thanks knslyr! Still, it's good to know that it really does make it better, if not top shelf quality.