I've noted over the years that brewing water profiles are one of those urban legends that keep growing. I keep seeing the same 'garbage' profiles repeated in multiple sources. There are some real bombs out there and brewers try them out and end up with a 'Soda Water' batch of beer. Some of the better sources have been Daniel's Designing Great Beer and Miller's Homebrewing book. But, even those sources had errors.
I took the time to thoroughly research existing and historic water profiles from the great brewing centers around the world. I went so far as to research the historic water sources back then and what those sources would have contributed to the water. In some cases, the modern water supply in those cities are the same as they were over a hundred years ago and the water is treated the same then as it is now. In some cases, water sources have changed and more digging was necessary.
Those water profiles were compiled using the best information available and checked for balance and accuracy. All of those profiles are now available in Bru'n Water.
Another factor that many people don't understand about some water profiles from those historic brewing centers is that the brewers of old did not always use that profile without adjustment. Even way back then, there were treatment methods to make the local water profile more amenable to the beers those brewers wanted to brew. One method is boiling and decanting to remove temporary hardness and alkalinity. I've included the estimated water profiles of those historic water profiles after they have been boiled and decanted so that brewers can use the most appropriate historic profile for brewing certain styles.
Another feature of Bru'n Water is the inclusion of generic water profiles that have been created to serve as good starting points for beer styles with various color and flavor requirements.
Bru'n Water goes even further and allows the brewer to assess their proposed water profile in conjunction with their actual mash grist to see if they will produce an acceptable mash pH.
Bru'n Water helps the brewer understand how a water profile affects the mash pH. There is a lot of knowledge and accurate water profiles in Bru'n Water. You can download it from the link in my signature line.