My last run I used a 45um syringe filter with a 20 gauge pin on the other end. ?I used the finished product in a warm state and it went thru the filtering apparatus pretty good for the first 2 10ml bottles and then it was very hard to push it thru. Was it becoz I was using a 20 guage pin or should I use a bigger pin(18 guage)? BTW which filter would allow more through put, a 45um 13mm or a 45um 33mm....all info requested is for a Syringe Filter apparatus