puits (1) traitement de l'eau (1) turbidité (1) sable (1) élimination (1) particule (1) arsenic (1) fer (1) ménage (1) ammonisation (1) débit (1) filtration (1) filtre (1) chlorophylle (1) substance chimique (1) adsorption (1) carbone organique total (1) ordre (1) taux (1) calcium (1) Rates (1) Water quality (1) Water--Purification (1) Water (1) Turbidity (1) Sewage--Purification (1) Sand (1) Phosphates (1) Order (1) Nitrates (1)