1. Prepare warm water diluted with one table spoon of baking soda and rinse the shower bag in it before the first application. 2. Lay flat the shower bag (filled with water) and keep the black side up to sunlight directly. Warning: 1. Water should not be heated over 50℃, or the service life of this product will be affected. 1. Please test the water temperature before use and add cold water for proper showing needs. 2. The water CANNOT be drunk. 3. Please empty and dry the bag before storage.