ิboth are preferred alternatives to Aerobic on site digesters, which require water input and sewer hookup or solution by dilution. The digester also creates problematic grey water with high BOD (biological oxygen demand, the allowable limits vary depending on local regulatory permits) and FOGs (Fats, oil and greases , the system is not connected to a grease trap). Either a composter or digester could be used at a commercial customer’s location or in the hauler’s yard.