This seemed like a fun experiment, so I got to work. First I investigated online. The consensus was that a single filtration made little difference. However, those who filtered multiple times were rewarded with better vodka.
In light of the anecdotal evidence, I was willing to subject the claim to my own trials. I purchased 500 mL of the cheapest vodka in the Wal-Mart liquor store, as well as a mini-bottle of Ketel One.
First I drank the Ketel One to establish a tasting profile for 'good' vodka.
Tasting Notes: Nosing contained slight hints of grain and fresh grass. Taste was neutral. Medium viscosity that coats the tongue. Smooth finish.
No surprises with the high-end brand. Chill it down, wave it at France, and enjoy your martini season.
Next up was Karkov brand. It comes from St. Paul, MN... In a mouthwash bottle.
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Tasting Notes: Fucking hostile. I was wincing before the glass reached by lips. I choked it down and shuddered.
Any improvement would be a welcome result.
I poured the remaining vodka through my Brita pitcher. I emptied the pitcher into a Tupperware bowl, and repeated four times, for a total of five filtrations.
The result: Much better. The unfiltered vodka had a harsh industrial taste which demanded strong mixers. The filtered vodka was inoffensive and drinkable. It did not have Ketel One's subtle aromas, nor the warming finish which makes great spirits just that.
The biggest difference was consistency. The filtered vodka was thin and watery. I didn't have the satisfying viscosity of the Ketel One, which is why I do not recommend it for serving Russian diplomats.
However, the filtered spirit was a clear improvement over its original form. It's ideal use is wherever cheap vodka would be called for, namely sugary cocktails made in huge quantities.
All things considered, a successful experiment.
