Raw water having high hardness is passed through a sodium based resin where hardness related calcium and magnesium ions are replaced with the sodium ions of the resin and treated water coming out of it is of commercial zero hardness. This type of plants are installed in all the process industries where water of low hardness is required for the process such as in textiles, feed water for boilers and cooling towers.
Selection chart
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| Model no | Quantity of resin in l | Size of piping & valves | m3/reg. On 200 PPM hardness |
| SF-1000 | 35 | 20 mm | 9 |
| SF-2000 | 55 | 25mm | 15 |
| SF-3000 | 80 | 25mm | 22 |
| SF-4000 | 120 | 25mm | 33 |
| SF-6000 | 150 | 40mm | 41 |
| SF-9000 | 225 | 50mm | 62 |
| SF-10000 | 280 | 50mm | 77 |
| SF-15000 | 410 | 50mm | 123 |
| SF-20000 | 560 | 50mm | 168 |
