You get fucked. My Houblon Chouffe clone seriously underattenuated. Was looking to hit under 1.010, but came up way short at 1.021 (from 1.082). That's 73% attenuation, not undrinkable, but not nearly what I had wanted. And that's with 17% cane sugar and pure O2. Not sure what went wrong.

Mr. X - nothing more than a brain in a jar.