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Fig. 3. Breakthrough curves and model prediction of Cl– and C. parvum oocysts in regular and water-repellent 12/20 silica sand. Initial concentrations in the applied feces was 12.5 g Cl– L–1 and 3.5 x 108 C. Parvum oocysts L–1. (a) 0.3 cm h–1 rainfall (regular sand, Exp. I), (b) 1 cm h–1 rainfall (regular sand, Exp. I), (c) 2 cm h–1 rainfall (regular sand, Exp. I), (d) 1 cm h–1 rainfall (water-repellent sand, Exp. II), and (e) 1 cm h–1 rainfall (regular sand with two water-repellent layers, Exp. II).
