The charcoal stick will absorb then diffuse the liquid slowly. The liquid will last for up to 12 weeks depending on location and temperature. Instructions for use: Remove all three components from their packaging; glass vessel, fragrance bottle and charcoal stick. Remove the lid from your fragrance bottle and pour the entire 200ml of scent into your glass vessel, being careful not to spill any of the liquid. If spilt, clean the liquid straight away with a soft cloth and warm water. Place your charcoal stick inside your glass vessel to finish. To refresh your scent, turn over your charcoal stick regularly.