How many of you use the deep liter (composting) method? Any pros/con's? I read about this in "Storey's Guide to raising Chickens" and Im curious.. Putting down 4 inches shavings, , then routinly breaking up the surface/fluff it, and add a few more inches. Supposedly this decomposing litter adds B12 to their diet as well (Ohio State Ag Experiment Station) and rather than getting filthy, after 6 months it the resulting compost dvelops sanitizing properties?