Usage: Before using for the first time it's recommended to flush the 20L bag with a cleaning solution of warm water and 1 teaspoon of household baking soda. This will ensure the internals are clean and remove any residual odours of the non-toxic PVC. The bag part should be filled with water as required for showering, and then the appliance laid out on a flat surface, in direct sunlight, with the clear side facing up. After around 3 hours (depending on sunlight) the shower is ready for use! You can expect the water to heat to around 45C on a full charge. The shower should be secured above head height, such as on a tree branch or door frame. Then once the shower and the user are in position, and water is showing an appropriate temperature, releasing the nozzle located on the shower head will allow gravity to drain the bag of the gently warmed water, cascading out like a traditional shower to allow you easy access to a good scrub.