We selected the Lustran 752 ABS because it was the most economical material that gave us the greatest strength. Mart adds that the material needed to withstand the cold Montana winters and moderate summers when composting activity can produce heat up to 115 degrees Fahrenheit in the composter. It is below the surface where the Nexus technology uses nature to eliminate a threat to the park's natural beauty and fragile ecosystem. The waste flows from the toilet down a chute into a 67 inch by 39 inch by 92 inch ABS composting tank full of wood chips that hold bacteria and other organisms necessary for decomposition. The liquid waste drains through a perforated floor into a subchamber for evaporation.
Air is pumped through the solid waste, which is periodically turned by stainless steel shafts.
About 95 percent of the solids evaporate out as liquids. The entire process is monitored and controlled by a computer. The 0.40 inch-thick sheets are heated to 350 degrees Fahrenheit prior to forming. The composting tank is molded in three separate square segments that are then bolted together to form the finished tank. The Lustran ABS has been performing well.