Replacement cycle: After 3-4 months of use, the humidifier filter should be replaced according to the water so as to keep the clear and the sprayed water cleaner 50 pieces per pack: sufficient number of humidifying sticks, so you don't need to purchase extra for a period of time, keeping the indoor space clean all the time Humidifier special: cotton, natural without bleaching, has good water absorption, absorbs flying or sediment invisible to the eye, and purifies the space in Tailorable: cotton, soft and for you to cut according to your needs, insoluble in water, non-stick, excellent water absorption effect Easy to use: just cut the humidifying stick to a suitable size and put it directly into the humidifier, or you can completely soak the replacement stick in water before putting it into the humidifier to the filtering