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Educational diagram illustrating a capillary water purification system with three sections in French.

**« Schéma technique réaliste d’un système artisanal de purification lente de l’eau par capillarité. À gauche, un récipient contenant 5 litres d’eau stagnante très sale. Sept cordes en fibres naturelles (coton ou chanvre), de 10 mm de diamètre et 40 cm de long, plongent dans l’eau. Chaque corde est étiquetée : capacité ≈ 800 mL/jour. Les cordes montent vers un bac de filtration placé 15 cm plus haut. L’eau absorbée tombe goutte à goutte sur un plateau perforé qui répartit le flux. Le bac est représenté en coupe avec trois couches épaisses : charbon actif (5 cm), sable (5 cm), gravier (5 cm). Sous le bac, un récipient collecte l’eau filtrée, étiquetée “Eau clarifiée (non potable)”. Des flèches bleues indiquent clairement le flux d’eau. Une note indique : “Débit total ≈ 5 à 5,6 L/jour. Temps moyen : 24 h.” Ajouter à droite une troisième partie montrant l’étape de désinfection à la Javel. Représenter un petit flacon de Javel (hypochlorite de sodium 2,6%) avec un tableau de dosage automatique : 1 L = 2 gouttes 5 L = 10 gouttes 10 L = 20 gouttes Formule : “Nombre de gouttes = 2 × volume en litres”. Inclure une flèche montrant l’ajout de Javel dans l’eau filtrée, avec le texte : “Attendre 30 minutes avant consommation”. Style éducatif, propre, clair, comme un schéma scientifique professionnel. »** Ver mais

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