Originally Posted by imrook
Whoa! I also had this problem and started using campden. My bottle says 1 tablet treats 20 gallons, so I use half a tab for each batch. Since I'm doing all grain, I end up using around 8.5 gallons total.
Yeah, I started with 1/4 crushed tab per 5g, but still had off-flavors, so went to 1/2 tab. It still wasn't totally gone. I did some research and found that JP has seen no ill-effects from using up to 1 tab:5g, so that's what I do. It's a cheap and easy fix.