Packs of Filters for Cat Water Fountain and 9 Packs of Replacement Sponges, for 3.2L Stainless Steel Cat Water Fountain

Every sip is clean and fresh: 4 layers of filter (high-density cotton, ion-exchange resin, coconut shell activated carbon) allow the water to circulate and be filtered. Box contents: 9 packs of replacement filters and 9 packs of replacement filter sponges. Replacement frequency: It is recommended to replace the filter every 2 to 4 weeks.