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L'eau vivante

Le principe de la piscine biologique repose sur la création d’un écosystème . À la base, de petits organismes : les bactéries , vont permettre d’obtenir une bonne qualité d’eau. Ensuite, phytoplanctons et zooplanctons se développeront. Grenouilles, insectes (libellules) et gastéropodes (escargots d’eau) pourront évoluer dans le bassin ou parmi les plantes. Cependant, plus le bassin sera utilisé en tant que lieu de baignade et moins les animaux aquatiques sauvages seront présents.

Astuce

Certaines espèces de poissons domestiques peuvent être introduites
dans le bassin de baignade afin de lutter notamment contre
la présence des moustiques et de leurs larves aquatiques1.

Les plantes oxygénantes

Les plantes oxygénantes sont faciles à repérer : elles ont des feuilles qui se développent sous l’eau.Callitriche Palustis ou étoile des marais

Ce type de plante est indispensable pour oxygéner l’eau. L’oxygène permet aux bactéries aérobies de faire leur travail de décomposition de la matière organique et elle permet aussi aux petits animaux munis de branchies de se développer (les gammares, par exemple, ont besoin de beaucoup d’oxygène dissout pour bien se développer).

Lors de la conception du bassin il faut leur réserver une zone, distincte de la zone de baignade et profonde d’au moins 1 mètre.

Le taux d’oxygène dissout dans l’eau varie au cours de la journée. Il est au plus bas le matin avant que la lumière du jour n’ait réactivée le processus de photosynthèse des plantes immergées et il culmine en milieu de journée quand le soleil est au plus haut. A ce moment vous pouvez parfois constater que des bulles d’air s’échappent du bassin. La saturation de l’eau en oxygène dépend de sa température (et aussi de la pression atmosphérique et de la salinité de l’eau), plus la température est élevée, moins l’eau peut contenir d’oxygène.

Notez aussi que la dégradation des végétaux, des animaux morts et des déjections animales sont des processus d’oxydation qui consomment de l’oxygène. Pour conserver le milieu en bonne santé, il est important de ne pas laisser pourrir de feuilles dans le bassin à l’automne.

Qu’en est-il des algues ?

Comme en bassin d’ornement, des algues peuvent se développer tant que l’équilibre biologique n’est pas atteint. La période transitoire peut durer jusqu’à douze à seize mois après le démarrage de la filtration. Quatre mois sont parfois nécessaires avant que les végétaux, plantés en début de saison (avril-mai), ne commencent leur travail d’épuration. Selon la conception du bassin, il est possible, les premiers temps, d’utiliser un robot ou un aspirateur de piscine pour nettoyer les parois.

Pour se baigner sur une plus longue période, est-il possible de chauffer avec une eau vivante ?
Avec les différents paliers et la présence de zones peu profondes, vous pouvez opter pour une cascade… l’eau se réchauffe naturellement plus vite qu’avec une piscine traditionnelle. Cependant, pour optimiser l’investissement, il est possible de prévoir un système de chauffage de l’eau (solaire, géothermie…) qui permettra en début et fin de saison, de gagner 4 ou 5 °C supplémentaires.
La plage idéale de fonctionnement biologique de la piscine naturelle se situe entre 20 et 26 °C et doit respecter les saisons naturelles et le cycle de la végétation.

 

 

 

 

 

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