Salt-free water softener
Nowadays, there are also water softeners that do not contain salt. Producers of these devices suggest they will save money because you no longer need to use salt. They might also say that this system means no salt ends up in the drinking water.
These suggestions, however, are both somewhat problematic. The salt water softening process never leaves salt in the water. Water softening is a closed process which means salt is never added to your drinking water.
Furthermore, a water softener that does not use salt does not soften the water as effectively. A lot more lime will be left in the water so the device is a little pointless. At the moment, a salt-based water softener is the best and most efficient method of softening your water.