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The deterioration existing density reduced continuously as corrosion and scaling proceeded. The procedure could be divided in to three stages. During Stage I (0-20 days), the corrosion present strength of low NaOCl quantity experiments (1, 2 mg/L) were greater than those of high NaOCl dosage experiments (5, 10 mg/L). The real difference might be explained by different oxidation potentials, pH and CaCO3 deposition. During Stage II (20-80 days), higher proportions of F
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