Features: Size: 12*2.7*2cm.Composed of 8pcs this set is suitable for the 1.8L pet fountain. Triple filtration: The filter can capture hair and debris. High-density coconut shell-activated carbon can remove fine impurities and microorganisms. Ion exchange resin effectively removes metal ions and prevents calculus. Keep your pet healthy: The pet fountain filters help to improve the taste of the water. Therefore cats will drink more and the risk of urinary tract infections can be reduced at the same time. Replacement frequency: Suggested to replace it 2-4 weeks to keep the water and fresh. Rinsing before usage: Rinse it before use to the activated carbon dust from shedding into water. Specifications: Color: white Material: artificial cotton+activated carbon+resin Quantity: 4pcs/8pcs(optional) Size: 12*2.7*2cm Package information: Size: 20*15*5cm Weight: 25g/50g Package List: 8*water fountain filters