Fertilizer and chemical runoff into the Chesapeake Bay is a big concern in Virginia so Jim and Mary built this O2 Compost system to do their part and address the problem. They have 16 horses at their breeding facility and use fine wood shavings for bedding. They use a Staff Shifter device to separate the manure from the shavings, which means the raw product going into the composter is 90-95% manure. According to local gardeners and landscapers, the finished compost is of very high quality. Approximately 30-40% of the compost is sold while the rest is used on the pastures which has eliminated the need for artificial nitrogen fertilizers. Since 2012, not a single load of raw manure has been put on the land for possible leaching into the water system.