Add edging if desired. 3. Add water slowly, filling in the world across the shell with sand as you go. When putting in a fountain, be certain that the height of the spray will not be greater than half the diameter of the pond; otherwise a lot of the water will end up being sprayed out of the pool throughout windy intervals. For example, it requires much more power to pump a quick-moving stream of water 5 ft up and ten feet from the pool for an intensive waterfall than to…