The Sun-Mar® Centrex 3000-NE is an extra-high capacity unit designed for very heavy cottage use or heavy residential use. The Centrex 3000-NE is a non-electric unit for those with no continuous 110 V power supply. All Sun-Mar® composting toilets incorporate a patented Bio-drum™ which ensures fast and odourless decomposition. Saves thousands of gallons of water, while recycling waste into safe useable soil. The unit is shipped fully assembled and is used with either a Sun-Mar dry toilet or an ultra-low water flush toilet (sold separately). When used with a Sun-Mar dry toilet a separate A/F Waterless kit is required. Its seasonal capacity: 8 adults or families of 10 its residential use: 5 adults or families of 7.