WildWash Shampoos have a dillution rate of 32 to 1 which means they last a very long time. They have designed a WildWash Mixing Bottle with the exact shampoo to water ratio. Simply fill with WildWash Shampoo to the shampoo fill line and then add water to the "water fill line" and mix. Pull up the nozzle and cover your pet with the mix, then lather, wash and rinse. This makes bath time easy, quick and straight forward for us and our furry friends.