Cigar Oasis Excel/XL Refill Cartridge
This cartridge will allow your Cigar Oasis to run approximately 6-12 months with normal use. You can refill this cartridge 3-4 times before you will need another one. So that is a pretty decent amount of time before needing a replacement. Unopened they last forever, so you can store a few in your closet for later use. That is if you can find room between the old tennis rackets and phone books from 1974.