The O'Briens' have 32 horses that utilize acreage that is divided between a valley and a hill top. To better accommodate both areas on their property, they constructed a second Cornerstone Compost System. They also incorporated a paddock sweeper into their routine which has added more waste volume to the compost bins making the second structure a very wise decision. The O'Briens "wanted a system that could compost manure quickly ... this was an efficient, clean way of accomplishing our goals."