This Catit Design Senses Drinking Fountain provides your cat with a continuous indoor source of cool, fresh-tasting, filtered water that encourages your pet to drink more. Drinking more water helps ensure proper kidney function, helping to prevent crystal formation that can lead to urinary diseases. The fountain includes a water softening filter that softens hard water by removing excess calcium and magnesium, typically found in tap water, to help maintain a healthy lower urinary tract. The fountain's surface is designed to retain water inside the unit while your cat drinks. Dishwasher safe. Also suitable for small dogs Dimensions: approx. 21cm diameter x H16cm, Base diameter: approx. 18cm, Water capacity: 3 litres.