- Just finished up stilling ~ 5 gal whiskey. I use 3/4 cracked corn & 1/4 malted 6 row barley. I lauter the mash to separate the grains from the wash. Every coupla days I toss a six gallon bucket of the spent grain out on the compost heap. It’s usually gone by the next day. We have some of the happiest deer in Georgia.Regardz, Dave H.