| Cold Lime Soda Process | Hot Lime Soda Process |
|---|---|
| It is carried out at room temperature. | It is carried out at elevated temperature around 100o C. |
| Reactions take place at slow rate. | Reactions take place at fast rate. |
| The precipitates formed are very fine so the use of coagulants is essential. | Coagulants are not required. |
| Filtration of the precipitates formed is difficult. | Filtration is easy and faster at higher temperature. |
| Dissolved gases are not removed. | Dissolved gases such as CO2 are removed. |
| Softening capacity is low. | Softening capacity is high. |
| Softened water having residual hardness of 60 ppm is obtained. | Softened water having residual hardness of 15-30 ppm is obtained. |
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