A water supply that will not drown. Coorogi Water Supply Features: A water supply that does not drown, allowing the chologi to be hydrated from a gauze that comes out of the water. If the gauze gets dirty, you can pull it out and cut it to keep the water supply surface clean. The included calcium releases the calcium to add calcium. Contents: 1 container: Gauze: Approx. 11.8 inches (30 cm), calcium dissolving stones; Size (W x D x H): Approx. 5.5 x 4.9 x 2.8 inches (140 x 125 x 70 mm) (32.9 fl oz (860 ml).