Several of my lagers have been a getting slight to moderate phenolic taste and odor. Some more of an odor but no taste. I was wondering if the mash tun had any factor in it as I never sterilze it since everything gets boiled that has been inside of it. It could also be bleach residue even though I think I am rinsing well. Just wondering if anyone sets about really cleaning and sterilizing their mash vessel. I use an igloo cooler. Thanks