I started to brew about a month ago. I'm on my second kit. Everything seems simple enough. However, it came with a package of Citric Acid. I have been looking all over the place and I've read were some brewers have said to use this, and some have said that it does not really effect the flavor or the outcome. I was hoping for a little advice. When should I add this to the wort process, assuming that is when I add it. Is it even worth adding in the first place ?