Just like any other food or water bowl for pets, the Drinkwell Pet Fountain and Big Dog Fountain should both be cleaned routinely in order to keep the product running smoothly and to provide your pet with the freshest possible water. The Drinkwell Cleaning Kit provides product owners with a convenient and easy solution to keep their fountain clean! Includes a 2” dia brush to help clean corners and edges, a 5/8” dia brush for cleaning the intake tube, and a 3/8” dia brush for cleaning the inside of the motor cavity.