Why has the ABV dropped after filtration? Don't worry, this is normal!This is completely normal across all carbon filtration methods and should only be a slight drop of 3% or less. Related articles Can I filter at an ABV above 50%? How do I find recipes created by Grainfather? What are the things that most influence the quality of spirit I can achieve? What are the best pH pitching levels for brewing beer? How to calculate the alcohol percentage of the spirit