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When I bought my Oasis they came with removable caps. All I did was pop off the caps and fill the cartridge with distilled water put it back on and hooked it back up and I have never had any problems keeping my humidor at the proper temps. Every now and then I throw in a little 50/50 with the water.
Why would yall replace it with PG or Climmax beads? Distilled water is all you need. The Oasis regulates the humidity already.
When my cartridge dried up I took it apart (carefully) and removed the florist foam and replaced it with an asorbant polymer. I found mine at a hobby shop but you can also find it here..... Polymer. You only need a tablespoon or so as it swells up when water is added.
BTW, the minimum order is 2 lbs which is a lifetime supply.