Thank you for viewing! (*^_^*) This product is brand new and unused ♡ Instant purchase is welcome!! This is a set of 4 filters for a pet circulating water fountain. ⚫︎ Materials: Cotton mesh, activated carbon, ion exchange resin. A set of 4 high-quality water-softening filters. Size: Approximately 12cm x 4.5cm ⚫︎ When cleaning the filter, do not use detergent; rinse off surface dirt with water. Especially in the summer, insects may appear, so it is recommended to clean the water fountain and filter, and change the water every 3 days. ⚫︎ The three-layer structure, with layers of coconut shell activated carbon and ion exchange resin sandwiched between high-density micro cotton, removes hair, dust, and odors, keeping the water clean and, at the same time, preventing water deterioration and maintaining a good taste. ⚫︎ Anyone can easily replace it. Before use, rinse the filter with water for 3-5 minutes to remove carbon dust and dust. It is recommended to replace the filter every 1-2 weeks. ※ We do not know which water fountains these filters are compatible with, so please check the size before purchasing. We have various other products as well ♡ #nico♡store