See Sizing Instructions below the chart.
| Cabinet Model |
||||
| NSC22 | NSC31 | NSCWC | NSC42 | |
 |
 |
 |
 |
|
| Max Capacity (grains) | 22,100 | 31,300 | 35,600 | 42,100 |
|
Hardness Removal (gpg) |
95 | 110 | 100 | 120 |
| Ferrous Iron Removal (ppm) | 6 | 6 | 3 | 11 |
| Two-Tank Model | |||
| NST30ED | NST45ED1 | NST70ED1 | |
 |
|
|
|
| Max Capacity (grains) | 30,200 | 45,300 | 70,000 |
|
Hardness Removal (gpg) |
90 | 120 | 120 |
| Ferrous Iron Removal (ppm) | 8 | 12 | 19 |
Choosing a Softener
Determine the Unit Capacity that best fits the household:
