http://www.naturalpigfarming.com/microorganismuse.htm

Natural Deep Bed Pig Farming uses indigenous micro-organisms (IMO's) to create and maintain a healthy deep bed litter flooring. It is these micro-organisms that will help break down fecal matter rapidly leaving you with a fertilizer rich material whilst ensure no smells or flies (an important factor in the tropics in particular where pigs and millions of flies can be synonymous). We apply a home made enzyme/microbe mixture fosters rapid anaerobic digestion of waste.