First I put 2 gallons in a carboy, and that got all slushy in my chest freezer. The ice didn't float to the top, but was dispersed throughout. So, I xfered the beer to a bucket and put that in the chest freezer. The whole thing froze solid. So I took that out and let it mostly thaw. Finally, I sanitized a knife and a mesh strainer and chunked up the ice a bit and scooped about 2 quarts out wtih the strainer.