The Drinkwell Pet Fountain needs to have it's filter changed every 6-8 weeks. These are the brand-name filters from Drinkwell designed for your fountain. With 3 to a package, these should last up to 6 months. The filters come in packaging with directions on how to remove and install the filters in your Drinkwell Pet Fountain, including diagrams so you can be sure you are doing it right.
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