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Q » How is hardness removed using the lime-soda process?
03 Nov, 2025
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A » The lime-soda process removes hardness in water by adding lime (Ca(OH)₂) and soda ash (Na₂CO₃). Lime reacts with calcium bicarbonate to form calcium carbonate precipitate, while soda ash reacts with magnesium sulfate to form magnesium hydroxide precipitate. These precipitates are removed through sedimentation and filtration, resulting in softened water. This method is effective for both temporary and permanent hardness, improving water quality for industrial and domestic use.
03 Nov, 2025
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