Hiya, Been lurking this part of the forum a good while now. Initially, I did a basic heat extraction using PG/VG 50/50 with a splash of 40% vol vodka. I used some aged Burley from http://www.wholeleaftobaccoonly.com/. I used some generic coffee filters which took about three days to filter about 120ml of concentrate! - a right PITA. Used at 20% in my final mix, it was pretty good I must admit. However, it was just too in your face and the coil gunking issue after 3-4ml was another PITA. I then bought some 'Havana Prime' from https://www.leafonly.com/ - a small trial run to see if I could get it to the UK - and oh my!...the leaf was stunningly fresh smelling. This brings me to where I am at now. I've used @Str8vision method using some aged Burley/Havana Prime and *40%vol vodka for a heated extraction using a 3.5L slow cooker (16hrs) - then froze the resulting concentrate for 36hrs. Obviously, most of the mix had frozen, but what alcohol was in there had not. So within minutes of the mix defrosting, there were quite a bit of sediment at the bottom of the jar. I then filtered it using generic coffee filters, then added it to an equal part PG/VG and put it back into the slow cooker without the lid on the jar. Using a digital thermometer purchased off the bay for a few quid - I left it in there for another five hours or so to hopefully, evaporate any excess water or alcohol. The resulting concentrate, which I use at 25% is so nice that words can not describe how gorgeous this mix is. So @Str8vision, you are a genius and I owe you one. *Just a note about the vodka: After some research, the highest strength vodka we can get over here is called 'Spirytus' and looks like I shall be using that in the future, because fractional distillation and other methods are not really an option. Finally, back to why I made this post. I've tried to find some 5 micron filters and the only ones that I can find are these http://www.ebay.co.uk/itm/3-x-10-PP-Sediment-5-Micron-Particle-Water-Filter-Cartridges-5mic-3-pack-/161155340223. If I just cut the material off the tubes and use them that way. Also will the actual material of the filter be OK to use? - I think it is made of Polypropylene. Would appreciate a bit of help, cheers.