Jandy Pro Series 1604CBF 4' x 6" Lip Clear Bottom Feed Sheer Descent Cascade Waterfall produces a clear arc of water that can be adjusted from a silent, glass-like sheet of water to a rushing mountain waterfall. A captivating addition to any new, remodeled, or existing pool or spa. The 6'' extended lip waterfalls produce the same effect as the standard 1'' lip Sheer Descent Waterfall, but allow for installation of brick or stone on the face of the raised beam.