Some fractions have more impurities than other. All fractions have impurities which cannot be filtered at hom.  In home making liquor potassium permanganate is used to remove some oils that gives unpleasant smell and hang-over. The substance became available in chemists in the last 50-70 years. In the past people used milk and egg white that would react with fusel oils to produce sediments that can be filtered.

Commercially produced vodka is a lot more pure that vodka distilled at home.