Ask ten experienced brewers what took their beer from “pretty good” to “wow,” and you’ll hear the same answer over and over: they finally got serious about their water. And for most of them, getting serious meant one thing, starting with reverse osmosis (RO) water. Here’s why the “blank slate” approach has become the gold standard for serious homebrewers, and why it might be the single biggest upgrade you can make to your brewery. The problem with “whatever comes out of the t