【3 Stages Filtration】 - The pet fountain filter adopts 3 kinds of filtration (resin, charcoal, filter cotton cloths), can ensure the water quality and improve the taste of your adorable cat and dog. 【Material Authenticated Material】 - Our pet water fountain filter is made of polyester pad, premium charcoal and lon exchange resin material, the outer polyester layer on each filter captures hair and debris and the charcoal eliminates odors and eliminates bad tastes. 【Application】 - Provide yourself a fantastic way to make cat / dog water pure with ease, your pet will drink much more fountain water than usual. Size: 5 x 5 inch. 【Easy to Use】 - Rinse the filter thoroughly with water before use and replace the filter every 1-2 weeks to keep the water fresh, encourage your cat and dog to drink more to stay healthy . 【Attention】 - Replace the filter every 2-4 weeks to keep the water freshness, keep your family friends happy life. Please note: rinse the filter thoroughly with water before use.