REED DIFFUSERS are a flameless alternative to candles and traditional diffusers. A group of diffuser reeds in a decorative bottle also make an effective centerpiece. The oil gets absorbed by the reeds and naturally diffuse fragrances. You can control the scent level by flipping the reeds whenever desired. Typically a 1oz to 2oz bottle of diffuser reed oil will last 6 - 8 weeks. As some scents tend to clog the reeds it is suggested that for best results, you replace the reeds on a regular basis (3 to 4 months).