PETLIBRO Automatic Water Fountain Filters I am selling extra filters because I replaced my automatic water fountain. Purchased this year, unused. ■ Compatible Models Replacement filters for PETLIBRO pet automatic water fountains. Can also be used to replace filters of the same shape in other water fountains. Please check your model and the shape of your original filter before purchasing. ■ Product Information Cat water fountain replacement activated carbon filters *8 & sponges *8, cleaning brush *1 Materials: Activated carbon, ion exchange resin, cotton, Maifan stone