PERFECT FIT: Our filters are 6 filters compatible with the cat fountain filter, suitable for 43717 cat fountains. Please check your fountain model before purchasing. Scope of delivery: 12 packs of cat fountain filters separately. The separate packaging is hygienic and clean and provides more protection for your pet. Keep your pet healthy: The improved filter is made of a layer of cotton, a activated carbon and an ion exchange resin. It can effectively remove hair, heavy metals and improve the taste of water, so that pets can drink clean and fresh water all day, which helps to increase water consumption and reduce the risk of urinary tract infections. Recommendations for use: : To avoid activated carbon dust (which will not harm your pets), soak the filter in water for 15 minutes and rinse thoroughly under running water before use. Change the filter every 2-4 weeks depending on how often your pet drinks and the number of pets using the fountain.