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The natural or biological swimming pool: functioning, advantages and disadvantages

The natural or biological swimming pool: functioning, advantages and disadvantages

The natural or organic swimming pool, also called swimming pond, is the ideal solution for those who want to find in their garden the feeling of bathing in the wilderness, in rivers, lakes or mountain streams for example .

No need for chemicals to maintain this type of pool. Nature, thanks to the fauna and flora present in a natural pool, takes care of everything. Such a pool is a natural ecosystem all by itself. Explanations.

A natural or biological swimming pool: what is it? Definition

To bathe in a natural or biological swimming pool, it is to find the feeling of swimming in the water of a river, a pond, etc, in short, to bathe in full nature. The first characteristic of these pools is their “self-cleaning” powerthanks to biological phenomena due to the presence of plants and micro-organisms in the same way as in bodies of water present in nature.

The natural or biological pool is composed of two basins that communicate with each other: one for swimming, and another called “lagoon area”, shallower, which hosts aquatic plants whose role is to filter and clean the water of bathing. These two basins are often connected by a so-called regeneration zone where the water is oxygenated.

How does a natural or organic pool work?

The natural or biological pool does not use chemicals or filtration systems to clean and purify its water. It does not require much maintenance. This type of swimming pool is not sterilized like a traditional swimming pool and micro-organisms develop there. Animals such as certain invertebrates, frogs or toads, which in particular clear the pool of mosquito larvae, elect residence in the natural or biological swimming pool, just like an aquatic flora. The presence of these plants and animals is a sign of a healthy environment.

In a biological pool, the water is purified naturally in the lagoon by aquatic plants, more precisely by their roots, microorganisms and specific rocks. The organic matter to be removed to obtain clean and healthy water is transformed by bacteria in such a way that it becomes food for the plants present in the lagoon area of ​​the natural or biological pool. Plankton is also present in these pools. It also has the ability to eliminate green algae and filter water naturally. The lagoon area is in fact a natural system of purification and filtration.

In order for the role of the ecosystem created in the natural or biological pool to be as efficient as possible, it must be composed of floating, purifying and oxygenating plants, bacteria and animals such as water fleas, insects, larvae or snails of water. The lagoon area should include purifying plants such as water hyacinth, Phragmites, a kind of large reeds, or Caltha palustris and oxygenating plants such as Hippuris, Elodea or Water Buttercup . For the aesthetic aspect, you can add water lilies, lotuses or papyrus; the same good plants purifying natural basins .

The lagoon area of ​​a natural or biological pool is shallower than the bathing area. The water can warm naturally from 5 to 6 ° C before being released into the swimming pool. For natural or biological pool owners who wish to heat up the water more, it is possible to install a heating system such as solar or geothermal heating.

The maintenance of a natural or biological swimming pool can be summed up as much as possible: once a week, there is a cleaning robot on the walls and the size of the plants lining the basin once a year.

How to build a natural or organic swimming pool?

A natural or biological swimming pool is built in the manner of a traditional swimming pool with a masonry structure or directly on a ground. In the latter case, it’s about digging a hole one to two meters deep on the surface that you want for your natural pool. Remember to reserve at least half this area for the location of the lagoon area that houses aquatic plants. Then place a rubber liner on the bottom of your hole and cover it with 10 to 15 cm of clean gravel, a material that helps the work of bacteria and promotes the natural degradation of leaves or herbs that may fall to the bottom of the hole. swimming pool. Choose a semi-shaded spot for your natural pool, which will promote but also protect the growth of aquatic plants.

The bathing part of the natural or biological pool must be separated from the lagoon area (built a little higher) by a small wall built 10 cm below the surface of the water. This installation allows the water to continue to move from one area to another while preserving the bathing area. To prevent the pool water from stagnating and to oxygenate it, a slight current must be created between the two areas of the pool using for example a circulation pump or the creation of a small waterfall between the two parts of the pool. This place is called the regeneration zone.

The benefits of the natural or biological swimming pool

As the name implies, the natural or biological swimming pool does not use any chemicals and therefore respects the environment. If its installation price is higher than a conventional swimming pool, in the long run, the expenses are lower due to a lower need for maintenance and upkeep than the natural pool. It also has an aesthetic advantage: the organic pool creates a real natural corner in your garden. The natural pool also provides a healthy swim without fear of allergies or skin irritations.

The disadvantages of the natural or biological pool

The price of a natural or organic pool is higher than that of a classic pool. But, as we saw above, its minimum maintenance saves money in the long run. The most difficult thing about setting up a natural swimming pool in your garden is to create a good biological balance that allows the water to stay clean and healthy, that is, to choose the aquatic plants best suited to your needs. basin. For the choice of these plants whose role is essential, it is better to call on a professional who will advise you at best.

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