Composting Toilets & Garden Composters

The Excel is not only our best-selling unit, but also the first self-contained composting toilet to be certified by NSF (National Sanitation Foundation) in 1989. Since then, we have made many modifications to improve performance in all three chambers – evaporation, composting, and finishing. When you purchase an Excel, you are purchasing the composting toilet that sets the standard.

The Excel is ideal for residential use having been tested by NSF with 4 adults using the unit residentially for six months of continual use. In this test, the criteria were that the unit operated odorlessly and produced clean, safe compost. Of course, it did, and the Excel is presently the ONLY self-contained unit in the world to be tested, certified, and listed by NSF.

The Excel is also ideal for cottage use as the primary toilet at your camp or cabin, or for light commercial or workplace use. The 2″ vent is attached at the top back of the unit and can be installed invisibly by running it through the wall and up the outside wall. For comfort the Excel has a sturdy detachable footrest which can be removed to pull out the finishing drawer.

Although the Excel can normally evaporate all liquids, a ½” emergency drain is fitted at the rear and this should be connected if the unit is to be used residentially or heavily, or if prolonged power outages are expected.

Color: White or Bone
Composting Capacity:
3-4 Residential
5-7 Weekend and Vacation Use

 The success of the Excel design meant that a three chamber unit could be specifically designed for those with NO continuous 110 volt supply. First launched in 1981, the Excel NE has long been the standard toilet for those living off the grid. A 1998 redesign gave the unit a rounded look, and recessed the drum handle.The Excel NE has no fan or heater. Odorless operation is achieved by a 4″ vent mounted at the top rear of the unit which acts like a chimney on a wood stove. For good air movement the vent should be installed vertically and to 2-3 feet above the peak of the roof.

The optional 12 Volt Fan should be installed if you need to install the toilet with any bends in the vent. No more than 2 45° bends are encouraged, even with the fan.

If the Excel NE is used residentially or heavily, or is in a place which is subject to downdraft, the optional 12 volt fan should be installed in the vent stack. This fan draws 1.4 watts and can be powered by a solar panel and 12 volt marine battery.

Evaporating capacity on the Excel NE is variable, so the 1″ drain at the rear should be connected to an approved drain pit, container, or other facility Please click here for more information on handling excess liquid.

Color: White Or Bone
Composting Capacity 2-3 residential, 6-8 weekend & vacation.

The Centrex 1000 model is ideal for those who have electricity and want a unit for a light seasonal application.

All central units, including the Centrex 1000 series, are fitted with a removable evaporating tray under the drum screen in the evaporating chamber. This tray helps to trap any peat moss debris, and provides an extra evaporating surface.

In light to medium seasonal use the Centrex 1000 is typically able to hold compost for the full season, and compost needs extraction only in the Spring.

The Centrex 1000 features a 260 watt heater in a sealed compartment under the unit and the standard Sun-Mar 25 watt turbo fan and 2″ vent stack to ensure odorless operation.

All 1000 series units are supplied with a 1″ drain hose which should be connected to the 1″ drain at the bottom left of the unit. Click here for more information on handling excess liquid