Safe storage of flammable materials involves keeping any products or tools that are prone to catching fire, such as alcohol-based solutions or aerosol cans, in designated fire-resistant storage cabinets away from heat sources. This protocol helps prevent accidental fires and ensures that all flammable materials are handled with care, reducing the risk of fire-related incidents in the spa. Regular checks should be conducted to ensure that all flammable materials are stored properly and that the storage areas are free of potential hazards.