[Activated carbon]: Fountain Filter It is made of activated carbon, which brings fresh water smell to the fountain of cats and dogs, and can filter pet hair and dirt effectively. The frequency is lower than that of ordinary filters. We recommend changing it every 3-4 weeks to keep the water fresh. [Health and Hygiene]: The fountain filter can encourage pets to drink more water. Promotes metabolism and reduces the risk of kidney disease in animals. Reject hair, viruses, bacteria, trace minerals, antibiotics, etc. [Easy to Use]: Cat water dispenser filters are easy to install, use and maintain. to clean. Noticed : Prior to installation, the new filter should be thoroughly rinsed. When cleaning the filter, do not use detergent, please use water to clean the surface dirt. Product Description Comment: Before use, rinse with water. Replace it every 2-4 weeks to achieve water freshness. Activated carbon (filtered) and shell coconut (keep refrigerated). With the fresh taste of water, it can effectively filter the dirt in the cat fountain. Material: coconut shell activated carbon food grade resin The size is shown in the figure Please measure the size before purchasing Note: Due to manual measurement, please allow 0-2cm difference. Thank you for understanding. The monitor calibration method is different. The color of the product shown in the photo may be slightly different from the actual product. Please refer to our size before ordering. Delivery Quantity: 8 pieces