Regardless of the fountain material, the guts of the system remain the same. It starts with a waterproof tub or basin that lines a hole in the ground to make a reservoir for the water. Above that is a rigid mesh screen that blocks large debris from getting into the tub. The screen is topped with a support system made from a strong but water-resistant material, such as composite decking, to keep the body of the fountain from falling into the basin.
The submersible pump is the heart of the system. It sits below the water line in the basin, recirculating and fine-filtering the runoff from above. Since the pump is electric, the fountain needs to be within reach of an exterior outlet—pump cords rarely reach beyond 50 feet, and manufacturers discourage the use of extension cords. It also needs to be accessible for maintenance after the fountain is built, so you’ll need to cut a trap door in the screen that’s big enough for you to reach in, unhook the pump, and pull it out. (The screen and support decking can be camouflaged with small stones or even mulch.) The pipe that carries the water to the top of the sculpture screws onto the pump. It also includes a small ball valve that will allow you to adjust the fountain’s flow, giving you the option of creating anything from a calming trickle to a formidable geyser.