You want silence. Elegance. A pool that reflects the sky without interrupting the scene. But do you want the water to vanish into the horizon? Or to sit flush with the terrace, still as a mirror?
While both are overflow systems, their visual language couldn’t be more different. One amplifies the landscape. The other disappears into it.
Let’s break down the difference – not just technically, but emotionally. Because choosing an overflow is never just about hydraulics. It’s about how you want the space to feel.
What’s the difference between a zero-edge pool and an infinity edge pool?
Overflow edges come in several forms, each with its own aesthetic. The right choice depends as much on the property as on personal taste.
The zero-edge pool or perimeter overflow
The zero-edge pool, also known as a deck-level or mirror pool, is one of the most refined overflow designs. The water sits flush with the terrace, with no visible break between the two. Its surface stays flat as glass, silent and reflective, with no visible coping and no gutter in sight. Water overflows continuously over all four sides into a perimeter channel.
In public pools, a grate covers this channel for practical reasons. In private projects, a discreet slot set into the terrace paving replaces the grate. The result is far cleaner and better suited to a high-end finish.
The water then flows by gravity to the balancing tank before returning to the pool via floor inlets. This configuration works equally well on flat sites, enclosed patios, and urban terraces – no view is required. It can be adapted to any pool shape, geometric or free-form. When a knife-edge detail is applied to a zero-edge design, the result is often called a Lautner edge pool. It is a more demanding and more exclusive version of the system.
The infinity or negative edge swimming pool
It is undoubtedly best known because it has a significant aesthetic impact. It reveals all its beauty on the ground with a slope, but it can create a beautiful effect on almost flat land.
Only one side of the pool is lower than the deck level. From the house or the deck, it feels as though the water disappears into nature. Of course, it’s only an illusion.
It is, of course, a visual effect. If they swim towards the edge, they’ll meet a solid wall. Making the gutter invisible from the house’s terrace is imperative to achieve such an overflow.
Otherwise, you will lose that impression of extension to the horizon! Silence depends on the precision of the wall’s profile. If it’s poorly designed, the soothing murmur turns into a relentless roar.
And don’t forget that a sea view is not essential for such an overflow.
Morana's advice
There is no single answer, only the right balance between slope, architecture and the effect you want to create. You may be drawn to the quiet elegance of a zero-edge pool or to the drama of a vanishing horizon. We will help you choose what suits your site and your vision.. We then design the overflow system in detail, from hydraulic balance to pipework layout.
Combining overflow systems
The two systems can also be combined in a single pool. An infinity edge on one side frames the view, while a zero edge on the other three keeps the surface calm and mirror-like. The visual result is exceptional and the hydraulic logic follows the same principles as each individual system.
This hybrid design offers the best of both worlds: a dramatic focal point and a refined, calming atmosphere.
Zero-edge vs negative-edge pools: key differences at a glance
| Feature | Zero-Edge Pool | Negative Edge Pool |
|---|---|---|
| Overflow direction | All four sides (perimeter) | One side only |
| Visual effect | Mirror-like, reflective surface | Water disappears into the horizon |
| Best suited for | Flat sites, patios, enclosed areas | Sloped sites with open views |
| Architectural impact | Minimalist, symmetrical | Dramatic, directional |
| Sound | Silent (if well balanced) | Silent or waterfall effect depending on design |
| Maintenance | Requires precise levelling and slot design | Requires invisible gutter and accurate wall profile |
| Technical complexity | High (balancing tank, slot overflow, tight tolerances) | Moderate to high (wall shape and hydraulic balance) |
Conclusion
Choosing between a zero-edge and a negative-edge pool comes down to your intention and the character of your property.
Each design responds to a specific atmosphere, technical configuration, and architectural ambition.
We first study the terrain, the views and the surroundings, then recommend the right solution for your project.
Frequently Asked Questions: Zero-edge and negative-edge pools
How is a zero-edge or infinity pool built?
Both are in-ground structures, in reinforced concrete: poured concrete, shotcrete or shuttering blocks. The edge, the gutter and the balance tank are on the execution drawings. Local trades build from that file.
How much does a zero-edge pool cost?
It depends on the design, the site and the equipment. A zero-edge pool needs a balance tank, a tuned hydraulic circuit and tight tolerances. A reliable budget comes after the project study, not from a range.
Can I install a zero-edge pool indoors?
Yes, if the design covers ventilation, humidity and waterproofing. The layout has to suit the room and still keep a stable overflow.
Can an automatic cover be fitted to an overflow pool?
Yes. A cover can be integrated with a submerged roller, a concealed pit or a bench. It has to be coordinated with the supplier at the drawing stage, so the alignment stays discreet.
Is a zero-edge pool really silent, even with wind or rain?
Yes, if the circuit is balanced. Water goes into the slot without a trickle or a splash. The surface stays flat, and the pool stays quiet.
Can I enjoy a vanishing-edge pool if I do not have a sea view?
Yes. A negative-edge pool can frame a garden, a hillside or a vineyard. The weir is placed toward the most open part of the view.
