The Catit PIXI Fountain Filter 3x pack contains replacement filters designed specifically for the Catit PIXI drinking fountain. Each pack includes 3 filters that help maintain clean and fresh water for your cat through a triple-action filtration system. Key features: • Pack of 3 replacement filters • Compatible with Catit PIXI drinking fountains • Triple-action filtration system • Easy to install and replace • Helps maintain clean and fresh water The filters should be replaced approximately every 30 days for optimal performance. The Catit PIXI fountain will indicate when it's time to change the filter through a blue blinking light signal. Only use genuine Catit PIXI fountain filters to ensure proper functionality of your pet's drinking fountain.