Simmering Granules are safe, clean and simple to use. No water is required in the well of the burner, just a couple of teaspoons of simmering granules, which will gradually release their scent over several hours. Each packet contains approx 6 uses and when the fragrance has evaporated, the granules residue can be easily disposed of. They are safe and bio-degradable and can be put into the bin (they will also make your bin smell nice after use!) Simmering Granules stay relatively cool whilst they are being burned and therefore are very safe to use. They leave no messy residue in the well of your burner and are easy and clean to dispose of. We know that once you have used simmering granules you will never look for another alternative. Suitable for use in any burner.