This set of 8 filters is perfect for Cup Cake Ceramic Pet Fountain and 2 L / 67 oz Round Stainless Steel Cat Water Fountain Filter impurities, catch hair and debris Easy to replace and long-lasting Suggestion: Change every 2-4 weeks depending on usage This set of 8 filters is perfect for Cup Cake Ceramic Pet Fountain and 2 L / 67 oz Round Stainless Steel Cat Water Fountain