Catit 2.0 Cat Senses Flower Water Fountain 3L Refill Catridges 5Pack

The Flower Fountain is only intended for use with Catit certified filters. Catit Triple Action filters are guaranteed to safely and optimally purify your cat?s drinking water for approximately 30 days. After that time, filtration effects will start to gradually decrease and bacteria may start to form within the fountain reservoir. Replace your Catit Triple Action Filter every month, or sooner, if the filter is visibly saturated.