What Is a Vanishing Edge Pool?

A vanishing edge pool — also called an infinity pool, negative edge pool, or overflow pool — is a pool design where one or more edges of the pool drop below the water line, creating the visual effect of the water extending to the horizon or blending with a view. Water flows continuously over this lower edge into a catch basin built below and is pumped back into the pool.

When a Vanishing Edge Makes Sense

Vanishing edge pools work best when: (1) the property has a significant grade change at the rear, allowing the catch basin to be positioned below the pool level; (2) there's a meaningful view — a valley, tree canopy, or distant landscape — that the edge can be aligned with; (3) the budget supports the additional structural complexity (vanishing edges add $20,000–$60,000 to a pool project).

Chester County's rolling topography — particularly properties in Westtown Township, Pocopson, and the Brandywine Valley — offers ideal conditions for vanishing-edge design. Gladwyne properties on the Main Line, with their elevation and valley views, are also strong candidates.

Construction Complexity

A vanishing edge requires a catch basin (typically 10-20% of the main pool volume) built at a lower elevation, a dedicated pump system to return catch basin water to the main pool, and precise hydraulic engineering to maintain water level at the edge without overflow or underfill. JHL Pools designs and builds vanishing-edge pools as part of our custom gunite service.

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