Catit Design Senses Drinking Fountain, With Water Softening Filter Large water-to-air surface maximizes oxygenation for fresher, better tasting water. Re-circulating system cools and aerates water. Consumes less than 4 watts, using less power than a night light. Advanced filtration purifies water by absorbing water impurities such as debris, food, hair and sediment. Water capacity: 100 fluid ounce.