Sun May 08, 2011 10:52 am
How does the ADF look? My fear would be that if you put in enough lactic acid to the point where the finished beer tastes sour then the pH in the mash tun would have been way off with probably detrimental effect from that.
Nevertheless it never hurts to try for salvage. You might try experimenting with calcium carbonate, calcium hydroxide, and sodium bicarbonate on glass full at a time quantities. If you find something that works then scale up to the full keg. I wouldn't get my hopes too high, though.