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Zero edge pool or negative edge pool ?

By April 7,2020 March 18th, 2022 No Comments

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The zero-edge pool, also called deck-level pool, has been very fashionable for some time now. Still, we should not forget the other types of overflows. There are, in fact, four main ones and, even if the principle of operating is more or less the same, the aesthetic effect can be thoroughly unique. The main visual difference between them is the water level relative to the deck.

The overflow in brief

When building a backyard pool, the question arises about the usefulness of setting an overflow. It is often put forward for aesthetic reasons, but this is not its only attraction.  Our blog features a post on how overflow works , but we remind you of the principle here.
Instead of being sucked by the skimmers, water flows through the weir and is collected in a lower gutter.

What’s the difference between a regular pool and an overflow pool?

Most of the pollution is found on the entire surface of the pools and spas: dust, pollen, dead insects, hair, and sun oil, among others.
The skimmers are the only openings to suck up the surface water and send it to the filtration system. A 10 × 5 regular swimming pool means a maximum suction length of 1 meter (2 skimmers).
Let’s consider the same pool with a weir over a length. The skimming of the surface water is multiplied by ten, and the impurities floating have no time to settle onto the bottom. Imagine then the performance of a zero-edge swimming pool!
That’s why, for the same pump flow rate, the filtration of the overflow swimming pool is much more efficient. The homeowners find the maintenance much more manageable.

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What’s the difference between a zero-edge pool and an endless pool?

The main difference between them is visual. It is owing to the position of the pool water level relative to the deck.

The pool with overflow under coping

It is the oldest system and is now used very rarely. It can still be seen in old swimming pools in some countries such as Morocco, Tunisia. Indeed, it was essentially built to allow the best skimming of the water surface.
These pools were often built without a balancing tank. The legend running about the high water consumption of overflow pools comes probably from there. Click here if you want information on how the balancing tanks work in the overflow pools.
Much less spectacular than the other types of overflow, its use is, today, often reserved for certain features, such as pool renovation or indoor pools. The water is, of course, not thrown down the drain but sent to the catch basin.

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. The homeowners feel that the water is disappearing into nature from the house or deck. It is, of course, a visual effect. If they swim to the wear, they will bump into a 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 is achieved by the correct realization of the top of the wall profile; on the other hand, if the design is not correct, the noise of a waterfall can become hellish.
And don’t forget that a sea view is not essential for such an overflow.

negative edge pool

 

The zero-edge pool or perimeter overflow pool

With its resolutely contemporary design, it is one of our favorites. It seems to “sit” on the landscape like a “mirror.” It is of great elegance and exudes a very calm atmosphere.
Perfectly silent, the water overflows into the perimeter lower gutter covered by a grate, often in public swimming pools. However, a slot in the terrace lining frequently replaces this ugly grating (see the photo). The water reaches the gutter and then the catch basin. This second version is undoubtedly much more aesthetic.
Contrary to popular belief, this deck-level pool is not limited to rectangular pools; you can see the proof here.

 

Zero deck pool Indonesia

Create slightly inverted slopes to avoid mixing rainwater with the pool water.
In conclusion, you can build a zero-edge pool in patios, flat spaces between buildings, or on the ground without any particular view. And remember, it can be adapted to all pool shapes, geometric or free form.

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The zero-edge pool with a weir on one wall : a luxury mix

After having explained the three main types of overflows: under-coping, infinity or endless, and zero or vanishing edge overflow, we will answer the question Can we mix several kinds of them? More and more of you are asking this question. And we can answer in the affirmative, as shown in the picture below.

 

zero edge infinity pool

Of course, the most frequently used combination is the negative overflow and the vanishing deck overflow. The visual effect of the former is combined with the atmosphere provided by the latter. Which one is your favorite?  Please have a look at other examples on our gallery.

The questions you may have

We have put together the main questions that homeowners who want to have a beautiful infinity pool built in their backyard ask us.

How to build a zero-edge pool or an infinity pool?

These are, of course, pools to be buried, at least partially. A builder will offer you concrete, shotcrete, or hollow block systems for your project; however, some manufacturers provide pools in kits and shells. It is also possible to consider self-construction if you have detailed plans.

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How much does a zero-edge pool cost?

The cost of an infinity pool is approximately 15 % more than the one of a regular pool. For a vanishing edge pool, you should add about 10%. The extra cost is mainly due to the balancing tank’s construction, the regulation, and the valves specific to this pool kind. By building your own overflow pool, you can save up to 40% over a professional’s estimate
We remind you that according to studies, building a swimming pool brings from 10 to 25% of added value to a house.

Indoor or outdoor swimming pool

The deck-level pool is very suitable for indoor installation. It can be perfectly integrated into a room dedicated to swimming; why not by adding a spa.

Is it possible to install a roller shutter on a vanishing edge pool?

Many manufacturers offer roller shutters to be installed in all f overflow pools. For projects with complex shapes we often call on GRANDO Cie.

What is the best overflow for my custom project?

Deciding whether to have a zero-edge pool or an infinity swimming pool is primarily a matter of taste. However, it would be best to take into account the profile of the ground, the features of the surroundings, the backyard relating to the house, the view. Before creating a custom project, we study each parameter and provide you with the most suitable design.

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