If for some reason you need to dispose of a unused CO2 powerlet/cartridge you first need to pierce the bottle to empty the co2 pressure. The best way I have found is to use a CO2 pistol like the Crosman 357.
Review and follow all the warnings on the product:
- WARNING : 12 gram CO2 under pressure.
- Do not mutilate or incinerate.
- Do not expose to heat or store above 120 degrees Fahrenheit.
- Keep CO2 cartages away from Children.
- Not for human consumption.