Hey Glort,
For a long while the residents of the household were "against" using rainwater...I switched back to municipal water and then stealthily, a couple of weeks later, I swung the valves back to the tanks... Within a little while, there were remarks as to how much better the coffee tasted, the kettle remained cleaner, water seemed to boil quicker, showers were easier to clean, soap seemed "soapier".... There was a slight green tinge to the water which I explained away as copper oxide from the pipes.... Months later, I got slack with monitoring the tank levels and we ran out of water, everyone "found out" that we were suddenly on tank water, of course the mandatory cases of dysentery, TB, Ebola and other lethal viruses were suddenly contracted and everybody started getting ill.... all within about 10 minutes.... I then pointed out that the mind is a powerful thing and we had been on rainwater for a considerable time already... Miraculously, all the ails disappeared and everyone is surprisingly healthy and very proud of our little water "farm" - So much so that when we do run low and switch to municipal, urgent requests are made after the minutest downpour to go back to the "nice" water!!
Cheers
Ed