And a higher Sodium level in the water - it's a simple ion exchange, Calcium
for Sodium. Need to watch that if you're on a Sodium restricted diet -
something the water softening folks won't tell you...

Mine did. They said that it didn't actually make a significant
difference, but if the idea bothered me, I should use potassium
salt instead of sodium salt, and they couldn't remember why,
but I shouldn't mix the two.