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A natural pool offers swimming in healthy, chemical-free water. Filtration, provided by aquatic plants, gives it a beautiful aesthetic quality. But the need for constant maintenance, the slow setup of the ecosystem, and the fact that it is not recommended to place the basin in the sun can be deterrents.
A natural swimming pool is a type of pond that operates on the principle of « lagunage ». Fully buried, the pool comprises two areas: the highly coveted swimming area and a biological filtration area, covered by plants and minerals. Unlike a traditional pool, which is disinfected with chemicals such as bromine or chlorine, the natural pool relies on creating an ecosystem for filtering and purifying swimming water. Part of the pool thus houses plants and microorganisms that will eliminate impurities. This area can be creatively designed with plants, sand, rocks, and small waterfalls. The appearance of the biological pool is therefore distinctly different from that of conventional pools, whether in terms of their shape, the color of swimming water, or the pool's edge occupied by its aquatic plants. The entire setup can very aesthetic and perfectly integrated into the environment, resembling a swimming pond or mini-lagoon depending on taste.
The natural pool relies on filtration accomplished through the constant circulation of water between the basin and the regeneration zone. This biological method offers many advantages, starting with healthier water that is chemical-free. Thus in theory, the impact on the environment is reduced. These pools also create a natural ecosystem, fostering biodiversity and providing a habitat for plants and a water source for animals. These basins can also help conserve water compared to conventional pools, as, if well maintained, they do not need to be drained in winter. Lastly, according to many users, they provide a more enjoyable swim as skin and eyes are not exposed to chemicals.
The design and construction of a natural pool differs greatly from that of a traditional pool. The advantage is that individuals have a wide array of options when it comes to the pool itself, as well as the materials and plants used. It should be noted, however, that for the same size, the required space for a biological pool will be larger due to the sizing of the filtration area. Therefore, this type of pool can cost between 20 to 25% more than comparable traditional pools. Expect to pay at least 35,000 euros for the installation of a pool on an area of about 100m2 (12.5m x 8m for example). Several components are taken into account when calculating the price: - Excavation: which can amount to several hundred euros depending on the volume of the pool, - The type and material used to create the pool: this cost can range from 25,000 to 40,000 euros, or more depending on the design, - Types of plants: several hundred euros are to be expected for the installation of the regeneration ecosystem. Some individuals, who are handy or daring, may undertake the construction of a DIY natural pool. The installation of this equipment is then much cheaper. However, we would like to point out that creating the filtration area can be complex. It requires specific knowledge to select the type and quantity of plants and minerals to obtain adequate filtration. Once the pool is installed, operating costs are added. Expect to spend between 400 and 600 euros per year to maintain the plants and water (pruning, additional filtration...). Moreover, as in a traditional pool, it is necessary to add water regularly to compensate for natural evaporation.
If water filtration is based on constant exchanges between the pond and the regeneration area, the latter is also very fragile. It requires permanent maintenance, and the bathing water needs a very regular surveillance (phosphate, nitrate, pH...). The balance of a natural swimming pool is based on a complex system of interactions between plants, fauna and micro-organisms present in the ecosystem. Therefore, regular water checks are important to ensure its quality. If an imbalance occurs, corrective measures must be taken quickly, as the restoration to normality can take a long time. Cleaning and maintenance of the pond and filtration system are also important. As for conventional swimming pools, this involves using a vacuum cleaner robot to clean the swimming area, brushing the side walls and removing impurities that have fallen to the bottom. For greater efficiency, it is also recommended to add a mechanical filtration system in addition to the natural filtration zone. This may be a hindrance to the fans of organic swimming, but it is essential for its sustainability. Lastly, it is worth noting that plant maintenance is one of the most important elements, as they play a crucial role in filtering and cleaning water. It is important to understand that the natural swimming pool is based on a unique ecosystem, and the plants, fauna and micro-organisms work together to maintain clean and healthy water. However, unlike a classic pond, setting up this ecosystem takes time. As a result, swimming may be delayed or postponed until a balance is found.
On paper, a biological swimming pool can seem like a dream come true. But watch out that this doesn't turn into a nightmare. Beyond the cost, maintenance and time for nature to do its part, the balance is also fragile. One of the recurring problems pointed out by owners is the presence of a large number of algae, making the water unsuitable for swimming: this is the phenomenon of eutrophication. The pool accumulates too many debris (dead leaves, organic waste...). The oxygen level falls and organisms can no longer filter the water sufficiently to purify it. Bacteria proliferate and can cause health problems if people swim in the water. Unfortunately, eutrophication mainly occurs in the summer, when the water temperature is too warm (above 25 degrees). Therefore, individuals must think ahead to determine the best place in the garden to install their pool, because full sun is not a good idea! Shade is far preferable. Also, keep in mind that the swimming temperature will be cooler than in a traditional pool. If you prefer warmer waters, this type of equipment probably isn't the right solution for you.
