Most of us can't control the quality of our local tap water, but we can purify our cat's drinking water to make it both healthier and tastier. Located in the heart of the fountain, the filter is constantly working its wonders on the water in the reservoir. The Catit PIXI Fountain Filter continuously purifies your cat's drinking water with Triple Action Filtration. It filters out debris, removes odours and impurities, and even softens the water by reducing magnesium and calcium levels. When present in high quantities, these minerals can accumulate in your cat’s lower urinary tract and lead to urinary tract diseases. Available in packs of 3 and 6 Compatible with all Catit PIXI drinking fountains Made of cotton mesh to filter debris, active carbon to remove odour and impurities, Ion exchange resin to soften tap water 1 Filter cartridge lasts for up to a month Compatible With: Catit PIXI Fountain, Catit PIXI Stainless Steel Fountain, Catit PIXI Smart Fountain Available Sizes: 3-Pack / 6-Pack