I’m a huge fan of bitters and have made a few successful attempts at making my own in the past. However, the one problem that I always come across is filtering the final product to get out all the sediment. For my attempts I’ve used coffee filters with mediocre success. They get out the big pieces but they’re slow as all hell and the real fine stuff still makes it through. I’ve read that vacuum filtration using a Buchner funnel works great, but the cost of entry is a bit steep for something I’d only use for bitters making.
John Park over at Make: Online may have just solved that problem for me. He has been filtering his bitters through an aeropress coffee maker with what look like great results. I’m interested to find out if John was able to get rid of the superfine particulate matter; from the looks of things he got most of it.