I have a friend who came up and brewed a batch of beer with me a few weeks ago. This guy was my judo instructor( genuine bad ass BTW lol) and has been brewing longer than I have but has never done all grain brewing so he wanted walked through it. He always tells me that the beer I make is better than his, and to be honest I think for the most part it is, although he has given me some VERY good beers. .. ANYWAY I kegged the batch of beer we made in two kegs to let him have half of it. He came up today to get his keg and brought me a keg to swap out. The keg he brought was filled with Star san. After he left I opened the keg he brought and the smell almost made me gag.. EXTREME sulphur smell and i KNOW it is from his water at home. IF he is brewing with this stuff it HAS to be affecting the taste of the beers. I am a salesman that sells cookware for a living so I have been in thousands of homes and a lot with bad sulphur water.. this was the strongest sulphur stench I have ever smelled. My question I guess is will this affect the taste since it is being boiled and do I tell him his water STINKS?