I used coffee filters to filter my limoncello, at the weekend, and to start with they worked well, but half way through they started clogging up something terrible, and I had to leave them for a half hour each time, and then change them, in the end I used a plastic filter from the coffee machine (that I'd sterilised, and washed to remove the coffee taste), and that could be easily rinsed and re-used.
I have a wine filter system, that I inherited, but have never used yet.
