The ECS Operator Training courses are comprehensive and facility operators are encouraged to participate beginning at facility start-up and performance testing. ECS engineers conduct the operator training courses following performance testing. The training course includes Compost Theory and Practice, the biological process of composting, selection of feedstocks and bulking agents, calculating a compost mix, biofilters and odor control, and regulatory compliance. Staff is also trained on the operation of each piece of equipment, maintenance, trouble-shooting and instruction on using the CompTroller PC interface and software. ECS often returns to facilities a year (or so) after the initial training to provide refresher courses, train new staff, or when installing additional equipment.