That depends on the hardness of the water entering the softener. Below is a simple chart which shows the additional amount of sodium you would consume by drinking one quart (32oz) of softened water.
| Hardness in Grains per Gallon | Sodium in Milligrams per Quart |
|---|---|
| 1.0 | 7.5 |
| 5.0 | 37.5 |
| 10.0 | 75.0 |
| 20.0 | 150.0 |
| 40.0 | 300.0 |
To make a more normal comparison using everyday foods:
| Item | Sodium in Milligrams |
|---|---|
| One slice of regular white bread | 161 |
| 3/4 cup of canned baked beans | 1130 |
| 1 tablespoon of ketchup | 204 |
| 1 average hotdog | 610 |
| 1 cup of whole milk | 127 |
As you can see, for very hard water measured at 20 grains you only have 150 milligrams per quart of water in sodium added which is less than one slice of regular white bread!