The All Fur You Seashell Pet Water Fountain Replacement Filter is the way to keep your Seashell Pet Water Fountain working at optimim levels to provide your furry friend with fresh and filtered water. Easy to change, it is recommended to replace the All Fur You Seashell Pet Water Fountain Filter every 2-4 weeks, depending how many pets are drinking from the same fountain. Rinse the charcoal filter thoroughly in cold water to help remove any excess or loose charcoal dust before inserting into the space. You can be rest assured you are giving your pet the best and healthiest water when you regularly change the Filter in the All Fur You Seashell Pet Water Fountain.