Each capsule is for single-use and it is compatible with all models. It has an operating life of approximately 122 hours. After such time, it is necessary TO RESET the diffuser and replace the capsule to start a new cycle. To get the best results in the prevention of respiratory diseases and for a complete environmental sanitation, KONTAK recommends the use of the diffuser 24 hours/7 days a week. Capsules are made of glass, ecological, and recyclable material par excellence. The transparency of glass reveals the purity of ingredients, only pure quality propolis, as found in nature.