First remove the outer cap from the fragrance glass, then the inner protective cap and pour in new oil. Replace the old sticks with new ones. Choose the number of sticks according to the size of the room, the temperature and the intensity of the smell. The smaller and warmer the room, the fewer sticks we recommend. The liquid soaks into the sticks and the smell begins to release within 12-24 hours. We recommend turning the sticks from time to time. The duration of the refill bottle is up to 32 weeks.