Should I be reducing salt amounts in recipes if cooking with tap water that has passed through a salt based water softener? Or is the amount of salt from the softener negligible? I'm probably over-thinking it.... :-)
Water softeners do not add any salt to the water. They use the sodium from the salt, not the salt itself.
This is known as an ion-exchange process
If your softened water tastes at all salty, you need to check with a maintenance engineer.
In 'health' terms, there is a slightly increased sodium content, but in flavour terms there is no additional salt.