With a Sun-Mar Centrex NE (Non-Electric) System, you can easily install a toilet anywhere without the need for electricity! Perfect for medium to heavy seasonal or light residential use, the Centrex 2000 NE allows for both a longer composting cycle, and larger waste volumes. The most environmentally sound method of waste treatment; these toilets use the natural processes of decomposition and evaporation to convert human waste into useful fertilizing soil. These units are odorless, due to a negative-pressure venting system. When used seasonally by up to 7-9 adults, compost will normally only need removing annually each spring. The Centrex 2000 NE may be used with one or more Sealand low flush toilets (not included). Install a toilet anywhere without the need for electricity Ideal for medium to heavy seasonal or light residential use Converts human waste into useful fertilizing soil May be used with one or more Sealand low flush toilets