Our foot bath balls contain sea salt and baking soda. It can help soothe and smooth tired, sore feet, reduce calluses, dry toes and odors, and leave feet clean and soft. The way to use it is very simple: 1. Fill the basin with hot water, 2. Drop the foot bath ball in it and let it bubble and dissolve. 3. Soak your feet for 20-30 minutes. And it can effectively remove odor.