Scented oil refill provides continuously diffused and carefully blended fragrance throughout your room for up to 45 days. Forest waters scent combines enjoyable layers of blackberry, dewy leaves and wild rosemary to create a welcoming atmosphere. Scented oil is perfect for use in hotels, motels, healthcare facilities, nursing homes, office buildings, restrooms and more. Refill is designed for use with Airwick scented oil warmers (sold separately).