This in-vessel rotating drum composter is composting food waste, and interestingly enough, the amendment being used in horse manure. The operators of this facility know that in order to get good quality compost out, they need to put the right blend of feedstocks in. The constraints of the blend consists of: 1) a proper percentage of moisture and 2) the correct proportion of Carbon to Nitrogen. Because the food waste stream on its own did not meet these constraints, there would need to be an amendment added to the food waste. The horse manure was available and also needed to be disposed of, so this composting facility determined the right blend of these 2 waste streams, and are now indeed, producing very good compost. No less than a triple win!