Catit Design Senses Fountain with Water Softening Cartridge, 3L 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