Ready to use. Absolutely no water necessary. Just apply, lather and towel dry. Leaves hair fresh, clean and odor-free. Hospital tested and approved. The choice of healthcare professionals throughout the world. No Rinse Shampoo is the comfortable, convenient and safe alternative to traditional shampoos. pH Balanced to be mild and non-irritating to the scalp. No Rinse Shampoo leaves the hair sparkling clean, odor free, soft and manageable. Used by NASA. Made in USA.