All cigar fans know about the reliability and ease of use of Cigar Oasis humidification units. But other than rocks, everything needs a little help. Depending upon your Cigar Oasis unit, you need to add distilled water every two weeks to three months. Now, these cartridges were created as replacements for the original after a year or so, but I like to have an extra on hand so when the low water warning comes on, I can just snap a full tank on and refill the empty at my leisure. This also will extend the life of the tank a bit. So if you own an Excel, Plus, or Ultra, get yourself a spare cartridge and make your life even easier.
Note: If you find that your Excel unit takes up too much space in your humidor, you can get the Excel Short Cartridge and free up some space. You'll need to refill it more frequently, but you'll also make room for a few more sticks.