Features: PET Water Dispenser Filter: The activated carbon in the filter can remove bad tastes and odors and keep the water clean and fresh. Cotton net: filter sediment in tap water, carefully collect hair, sediment and dirt. Eco-Friendly Fountain Filter: Made of premium cotton. Contains 4pcs/lot. The filter is replaced every 2-4 weeks to keep the water fresh. HELPS PETS DRINK HEALTHY WATER: Helps filter drinking water so our pets can drink water safely and stay healthy. Note: The size is 6.5 x 3 cm. Be sure to measure the size of the water dispenser filter before purchasing, as shown in the picture. Features: Material: cotton. Dimensions: 6.5 x 3 cm. Contents: 4 cotton filters. Pet Water Dispenser Accessories