Also known as negative edge or infinity edge, this feature offers the illusion that the pool (or spa) water is pouring over the edge of the pool into another body of water, or perhaps down a hillside.
To achieve a uniform flow of water over the vanishing edge, it must be perfectly level. (Otherwise, an oversized pump and excessive electricity will be required produce the desired effect.) A vanishing- edge feature also requires careful design of the catch basin and surge tank (for excess water when people are jumping into the pool).
Therefore, this elegant water-feature design and construction should not be entrusted to anyone but an experienced professional. (See also Perimeter Overflow.)