I'm a bit of a troglodyte on this question. When I first started out all-grain brewing I got an analysis of my water from the local water company, I checked it against John Palmer and the first time or two I religiously added a pinch of this and a pinch of that - like DocAnna I weighed it out to within a gnats. I then asked our local micro what they did and they said "Chuck the water in and bring 'er to the boil!" No treatment at all. I do now, if I remember, add a campden tab to vent off the chlorine, but it depends on time of day, number of pints previous night, colour of sky, etc. I guess what I'm saying is that for me, the difference between a pinch of CaCl or not is insufficient in results to be worth getting hung up about.