Perfect fit: the cat fountain filter is compatible with the cat fountain filter, suitable for 43717 cat fountains, Pixi 2.5 L drinking fountain cats. Please refer to the size and shape of the filter to place your order.Keep your pet healthy: the improved cat fountain filter consists of a cotton layer, an activated carbon and an ion exchange resin. It can effectively remove hair, heavy metals and improve the taste of the water, allowing pets to drink clean and fresh water all day, which helps increase water consumption and reduce the risk of urinary tract infection.Multi-filtration system: this cat fountain filter uses a triple filter. The high-density cotton layer filters out hair and other deposits, and the activated carbon and ion exchange resin help you filter out most impurities and heavy metals so that the water always tastes fresh and clean. Replacement filter ensures that the water your cat drinks is safe enough!Frequency of replacement: Please soak the filter in water for 5 minutes before use and rinse thoroughly under running water. Replace the filter of the cat drinking dispenser once in 1-2 weeks in summer and once in 2-4 weeks in winter to ensure clean drinking water. Change more often when more than one pet uses the water dispenser.Package includes: you will receive 12 packs of premium cat drinking fountain filters, the separate packaging is hygienic and clean and brings your pet more protection.