Replacement Water Filter, Replacement Pre-Filter Sponges, Compatible with Petory® 74oz/2.2L Automatic Pet FountainNice Three Filtration System: Composed of a cotton layer and activated charcoal. Effectively to filter hair, heavy metals, keeps water fresh and improve the taste of the water. Easy to Install and Replace: The filter replacements are designed for effortless installation. Simply remove the old filter, insert a new one into the designated compartment, and you're all set. The process is quick and hassle free, allowing you to keep your cat's water