This jar of Visol humidor crystals will keep your humidor within a range of 66-70% humidity. This way you'll never have to worry about a dry humidor or your cigars going to waste. All you need to do is add Visol humidor solution to the rim of the jar and remove the liner off the cap. The crystals will then expand and absorb the solution. You will have to add the solution to the rim of the jar on a weekly basis to keep this system charged.