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Washing soda Alkalinity Sodium bicarbonate NaHCO 3 Baking soda Foaming Sodium hydroxide NaOH Caustic soda Alkalinity, embrittlement Sodium sulphate NaSO 2 Glauber salts Alkalinity Silicon dioxide SiO 2 Silica Hard scale Table 1: The common impurities in water. ................
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