This propylene glycol humidor solution (pre-mix) is ready to use to achieve 70% humidity. Two-way humidification is no longer state of the art but the norm in cigar preservation. Simply pour the solution into your foam or crystal humidifier and pour any excess back into the bottle. Return your humidifier back into your humidor, and it will do the job. Check your hygrometer within a few hours and note the new reading.