The term “infinity pool” is sometimes used for an “infinite edge pool,” “vanishing edge pool,” or “negative edge pool.” In an infinity edge pool, the water flows over one or more of the edges of the pool, creating a visual effect of water with no boundary. They have one or more exposed walls, known as a “weir wall”, that’s a fraction of an inch shorter than the surrounding water level, allowing the water to flow into a catch basin below. When positioned on a sloping elevation, infinity edge pools create the stunning optical illusion of water extending ‘infinitely’ towards the horizon. In the last 10 years infinity edge pools have grown in popularity. First seen only at the most exclusive luxury resort swimming pools, infinity edge pools are now as popular in residential swimming pool builds. The dramatic effect of an infinity edge pool is hard to ignore. It is said that infinity edge pools are one of the single most important design trends in the swimming pool builder industry. We absolutely agree.