The key to the success of the CENTREX 3000 lies in its three chamber design. Each of the
three chambers; patented Bio-drum, compost finishing drawer, and evaporation chamber,
have their own independent environments for optimum efficiency. The CENTREX 3000
electric version has a thermostatically controlled heater and fan assembly to help evaporate
liquid and should be used where there is a constant electrical supply. The CENTREX 3000
NE (non-electric) version is for use where there is no continuous electric supply. The
CENTREX 3000 NE has no heater but does include a 12 volt fan. Odorless operation is
achieved by a 4” vent assisted by the fan which acts like a chimney creating a partial vacuum
within the unit.
The Patented Bio-Drum
Unique to Sun-Mar, the patented bio-drum provides the necessary mass to maintain good
compost and allows easy aeration of the compost by simply turning the drum. Excess liquid
will exit through a screen in the bottom of the drum into the evaporation chamber. Mixing the
Bio-drum is accomplished by rotating the handle in a clock-wise direction. Compost moves
automatically through the drum with SUN-MAR’s unique Autoflow ® techology.
The Compost Finishing Drawer
The compost finishing drawer sits in the opening in the front right of the unit. Since the
CENTREX 3000 automatically discharges finished compost into the collection chamber at the
end of the unit, this drawer is used only if you need to remove all compost from the drum.
Removal of the compost finishing drawer and access panel allows access to the evaporation
chamber for cleaning and maintenance purposes.
The Evaporation Chamber
The evaporation chamber is the floor of the unit under the compost finishing drawer. This is
the area where any excess liquid will gather for evaporation. A safety drain exits from the left
side of the composting toilet which will drain over-flow liquid that is not evaporated to an
The Collection Chamber
CENTREX 3000 units incorporate SUN-MAR’s
unique Autoflow ® technology. As the drum rotates,
compost moves automatically through the drum and
into a separate collection chamber located near the
end of the unit.