By Philippe Guillet

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Elle est équipée d’une vanne de vidange en zone basse pour le nettoyage. Liaison entre la bonde de fond et la cuve de décantation 26 CHAPITRE 3 - MÉMENTO DU CONSTRUCTEUR BIO Le filtre mécanique (filtre à grille) qui retient tous les déchets d’une taille supérieure à 200 µ par exemple. Ces filtres sont à entretenir de manière régulière pour éviter tout colmatage de la grille. La fréquence d’entretien du filtre mécanique varie selon le modèle et l’environnement de chaque bassin. Chambre de décantation puis chambre de filtre mécanique Après cette filtration mécanique, l’eau est redirigée au moyen d’une pompe piscine vers le lagunage qui traite la partie biologique de la filtration.

Autre inconvénient de taille à attendre en cas de mauvaise conception : le colmatage (sédimentation des particules en suspension) des supports de plantation au bout de quelques années. Si nettoyer un filtre de 200 L ou plus en retirant des filets remplis de matière filtrante, des mousses, est possible, il est inconcevable de retirer puis de nettoyer plusieurs milliers de litres de pierre de lave en vrac... et recouverts de plantes pour compliquer la tâche. Il faut bien en prendre conscience : toute action d’entretien est impossible.

Les plantes envahissantes Au titre des plantes à éviter absolument dans un lagunage décoratif figurent toutes les plantes envahissantes possédant un système racinaire traçant (rhizomes) : Carex nigra 36 CHAPITRE 4 - LE GUIDE DES PLANTES s Carex riparia • Carex nigra, Carex riparia et autres espèces de laîches à stolons envahissants. Ces variétés sont extrêmement traçantes et finissent par envahir toute la lagune en deux ou trois ans seulement. • Cyperus longus ou faux souchet. Cette plante, en zone tempérée à chaude, devient vite très envahissante.

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