Package includes: you will receive a sufficient amount of sponge filters for cat water fountains, enough quantity to meet your usage and replacement needs, ensuring clean drinking water for your pets Size Information: The pet water fountain foam filter is designed to be compatible with the 84-ounce/2.5-liter cat water dispenser; please pay attention to the size before purchasing to avoid incorrect orders High-quality material: the cat fountain filter is made of sponge, providing effective filtration for the pet water fountain, delivering clean and fresh water so your pets are encouraged to drink more Filter impurities: The sponge filter for cat water fountains effectively filters impurities, capturing pet hair and debris, ensuring every drop of water is healthy, making the water cleaner and fresher, and extending the life of the pump Warm Tips: The sponge filter for cat fountains is not suitable for repeated use; as the filtered impurities remain on the sponge, it is recommended to replace the sponge filter every 2-3 weeks