First let me say that is a great article. I've experienced many of the same maladies from tap-water. I wanted to give you some information I got from one of the TV networks news programs about 20 years ago. I have also seen this info repeated on cable's Weather Channel at a later date. It seems there was an old farmer's belief in Russia that the season's crops would be bountiful if there was a lot of lightning with the spring storms. This story had been around for many years. Some meteorologists decided to "do the science" and see if there was any truth to the belief. They found that the electrical charge released into the atmosphere during lightning causes the molecules in rainwater to bond with an extra nitrogen atom from the air. This makes the rainwater richer in nitrogen, sort of a weak fertilizer solution. I've always thought this helps explain why one good thunderstorm will green the lawn and everything else when a whole summer of hose watering does not do one tenth as much good. Thanks again, I always enjoy your articles.