Infinity Edge vs. Perimeter Overflow Pools: What's the Difference?
Updated: 6 days ago
An infinity edge (also called a negative or vanishing edge) sends water over one edge into a catch basin so the surface merges with the view beyond it; a perimeter-overflow pool spills over all its edges and sits flush with the deck on every side — two different details, built two different ways.
The Short Answer: One Edge vs. Every Edge
Both designs do the same basic thing: they let water run over the top of a pool wall instead of stopping below it, so the surface looks like it has no edge at all. The difference is where. An infinity edge does it on one side — usually the side facing a view — so the water appears to continue into the bay, the Gulf, or the sky beyond. A perimeter overflow does it on every side, so the water sits level with the surrounding deck all the way around and reads like a sheet of glass or a mirror.
How an Infinity Edge Works
On an infinity-edge pool, one wall is built slightly lower than the water level. Water flows over that edge and falls into a catch basin or trough built below it, out of sight from the main viewing angle. From there, the water is pumped back into the pool, so the overflow runs continuously while the system is on.
The effect depends on what is beyond the edge. Looking toward open water or a long view, the pool's surface seems to merge with it. Into H2O Pools' infinity-edge work includes a commercial infinity-edge pool at 500 Ocean in Boynton Beach and an infinity-edge spa on Fifth Avenue in Naples, where the vanishing edge is on the spa rather than the pool.
How a Perimeter Overflow Works
On a perimeter-overflow pool, the water level is set at the top of every wall. Water flows over the full perimeter into a channel or gutter around the pool, then to a collection tank, and is pumped back. Because every edge overflows, there is no exposed band of wall above the water and no visible gap between the water and the deck.
On Marco Island, our Blue 360° Infinity Pool & Spa is a large perimeter-overflow lap pool — a long lap pool whose water runs over all four edges, Gulf-front — with a perimeter-overflow spa built the same way alongside it. In Southwest Cape Coral, our 360° Infinity Pool & Spa — our original 360° design — uses a precisely engineered 360-degree perimeter-overflow system on both the pool and spa to create its mirror-like surface. In Northwest Cape Coral, a separate 15×30 360° infinity pool with no spa uses the same 360-degree perimeter overflow inside a screen enclosure.
What Each One Asks of the Build
Neither edge is a decorative add-on. Both are part of the pool's structure and its hydraulics, and both have to be designed from the first drawing.
Level and precision. An overflow edge only works if it is level. Small errors show up immediately as water running heavily on one side and barely on another. On a perimeter overflow, that precision has to hold around the entire pool.
Catch basins, channels, and tanks. The overflowing water has to go somewhere. An infinity edge needs a basin below the vanishing wall; a perimeter overflow needs a channel around the pool and a collection tank to hold the water that is moving through the system.
Plumbing and equipment. Water that leaves the pool continuously has to be returned continuously, so the plumbing and pump design are planned around the overflow, not added afterward.
Construction sequence. The edge details are formed, plumbed, and inspected as the shell is built. That is why these pools are part of our specialty construction work.
Which Sites Suit Which Edge
An infinity edge rewards a view. It makes the most sense where one side of the pool faces something worth looking at — a canal, the bay, the Gulf, a lake, or open land — and where the site allows a catch basin below that edge.
A perimeter overflow works on almost any site, because its effect does not depend on what lies beyond the pool. It suits modern and architectural homes, flush decks, and designs where the pool should read as one clean surface from every angle. The right choice comes from the property, the house, and how you want the water to look from where you will actually stand and sit.
Spas Count Too: Raised and Spillover Edge Details
Edge details are not only for pools. A spa can have its own vanishing edge, like the Fifth Avenue spa in Naples, or its own perimeter overflow, like the spas of our Marco Island and Southwest Cape Coral 360° infinity pools. A raised spa can spill over into the pool, turning the spa wall into a water feature. Planning the spa and the pool edges together is what makes the whole design look intentional.
Deciding With a Builder, Not a Brochure
Infinity and perimeter-overflow pools look effortless when they are finished, but they are among the most demanding pools to build. Before you choose one, ask your builder to show you completed examples, explain how the overflow water is collected and returned, and walk you through how the edge will be kept level.
Into H2O Pools & Spas is owner-operated: you work directly with Nancy and Chris Doyle. Chris has more than 45 years of hands-on swimming-pool construction experience. If you are considering a specialty edge, tell us about your property and we'll put together a free estimate. Request a Free Estimate · Call 239-413-7890
Comments