CMP Natural Wonders® 25577-181-000 18" Gray Waterfall with Back Port and 6" Lip - 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. There is no limit to water feature design with this timeless waterfall collection.