Interesting.
Is Brita a simple charcoal filter?
I talked to chemists here in my institute, they told me that filters sold here, that are mostly ion-exchange, will give an unpredictable result on ethanol solutions.
OTOH here we have vodka that is good enough without any additional filtering, it may simply kill the taste.
I use some Russian filter for tap water, it was a present, I am satisfied with tap-water quality here in Moscow, but if I have a filter and a stock of cassetes for it - why not use it? At least it kills every trace of chlorine smell.