Rinse the shower with warm water and 1table spoon of baking soda before initial use. * fill with water, place on a flat surface with black side up and expose to direct sunlight. * Maximum temperature should be achieved in approximately 3 hours, it can makes the 15? water reach 45?. * test the water temperature before use as temperature can get up to 50 degrees Celsius on a warm day. * Suspend using the hanging cord and suspension handle and shower is ready for use.