Our Low-VOC Reed Diffuser Base will hold a maximum amount of 25% fragrance oil. For example, to make a total of 4 ounces of fragranced reed diffuser oil, you would add 1 ounce of fragrance oil to 3 ounces of Reed Diffuser Base. Different fragrance oils may be mixed for a custom fragrance, as long as the total amount of fragrance oil does not exceed 25%. Excess fragrance oil will clog your reeds and prevent the scent from diffusing into the room. Reed diffusers are not meant for whole home fragrancing. They are best utilized in rooms such as bathrooms, bedrooms or offices. Choose an area with good air movement, or place near a sunny window to further enhance the fragrance. Take care that you do not place in the way of pets or small children as this is a liquid product and may spill. Insert 5-8 reeds per bottle (insert and flip for instant fragrance) should be sufficient to disperse the fragrance. Using more reeds will throw a stronger fragrance, but will also evaporate the oil more quickly, depending on the overall conditions in your home. Reeds will last around a month (may vary), simply replace with fresh reeds. Reeds cannot be re-used or cleaned.