Catit Triple Action Replacement Original Water Fountain Filters are designed to help remove odors and impurities and filter out debris from your furbaby’s cat fountain water bowl (sold separately). These filters help soften the minerals like magnesium and calcium in tap water to help prevent urinary tract diseases, a common health issue for cats. The mesh material is also great in preventing any large debris from getting in the water bowl, which keeps the cat water fresh and clean. These filters require very little maintenance, and it’s recommended that you simply replace the filter each month with a new one. The cartridges are authentic cartridges made by Catit, and are designed for the Catit Senses 2.0 cat drinking water fountains (sold separately).