CMP Natural Wonders® 25577-181-120 18" Gray Waterfall with Back Port, 12" Lip. CMP is proud to be the leading manufacturer of pool waterfalls. Natural Wonders® Waterfalls are a beautiful addition to any new or remodel pool or spa. A Natural Wonders® Waterfall may be adjusted from a peaceful clear falling sheet of water to a bold, thundering water feature that adds excitement and style to any project.