Features: Size: 110*25*9mm. This set of 8 is for 1.8 liter pet fountains. Triple Filtration: The filter can absorb hair and dirt. High-density coconut shell activated carbon removes fine impurities and microbes. Ion exchange resin effectively removes metal ions and prevents tartar. Keep Your Pet Healthy: The pet fountain filter helps improve the taste of your water. Therefore, cats drink plenty of water and can reduce the risk of urinary tract infection at the same time. Replacement Frequency: It is recommended to replace every 2-4 weeks to keep the water clean and fresh. Rinse before use: Rinse before use to prevent activated carbon dust from splashing into the water. Color: as picture shown Material: cotton+activated carbon+wool+resin Note:1. Please allow a little error due to manual measurement. Please make sure you don't mind before bidding.2. The color may vary due to different monitors, please understand. Note:Hello, please pay attention to your delivery address when purchasing products. If your receiving information (such as: name, street, house number, doorbell/email without name, etc. is incorrect, the order will not be delivered correctly.)