My brother and I were working on importing soju. It is a Korean liquor which is exempt from import duties. It is a bit rough in that it contains way too much fuselage alcohols. We were testing if the harshness could be tamed by filtration. Testing with Britta and pur filters. Each filtration pulled about 25% of the ethyl alcohol tested with a hygrometer. Both filters contain ion exchange pellets. When filtered through plain activated carbon, no drop in ethyl alcohol. I then tested it through some ion exchange resin pellets I had left over from a soft water system recharge. Same result. About 25% less alcohol based on specific gravity. Don’t know why it happens, but it does.
Fuselage = fusel. Damned autocorrect
Thank you for responding.
The change in density that you observed does not equate to a capture of ethanol by the filter.