Composting is Nature's Way
Every living organism consumes nutrients and creates waste. To transform

waste back to nutrients and complete this cycle, nature uses the processes of decomposition and evaporation. As is often the case, nature seems to be doing business in the best way possible.

That's why Sun-Mar toilets are designed not only to harness these natural processes, but to optimize and accelerate them.

Toilet waste is over 90% water content. This can be evaporated and carried back to the atmosphere through the vent system. The small amount of remaining material is recycled into a useful fertilizing soil.

Wherever there is a poorly working septic system, a Sun-Mar can take care of the toilet waste; where there is an outhouse we offer the luxury of an indoor facility; and where there is no toilet at all, a Sun-Mar provides the right environmental choice. Sun-Mar units are economical, quick to install and easy to use.

Because no chemicals and no septic systems are used, fragile environments can be protected. A Sun-Mar composting unit is an environmentally healthy choice for recycling human waste.
The Sun-Mar system produces no pollutants, while collecting nutrients. With a Sun-Mar, recycling is made easy!
Odor Free
As well as ensuring an aerobic breakdown in the Bio-drum, Sun-Mar ensures an odor free environment by engineering the air flow within the unit to maintain a partial vacuum at all times. Air is being drawn in either by a fan (or on non-electric units by the vent chimney) over the evaporating chamber and up the vent stack. Not only does this evaporate excess liquid, but by continuously pulling air in we ensure no smell escapes from the unit.

Evaporation is assisted on electric units by a thermostatically controlled heater in a sealed compartment underneath the evaporating chamber.

The EXEL (electric)
The Excel is the best-selling unit in North America and for good reason. It is a high capacity Bio-drum toilet that is very simple to operate, features well proven technology and is extremely reliable. The Excel was the first ever self-contained composting toilet to be certified by the National Sanitation Foundation (NSF). So, when you purchase an Excel, you are literally purchasing a composting toilet that sets the standard.

The Excel has enough capacity that it can be used just about anywhere; in residences, cottages and even in light commercial applications.

To simulate residential use the Excel was tested by the National Sanitation Foundation (NSF) at maximum capacity for 6 continuous months, during which the Excel produced no odour and produced a clean, safe compost. Only Sun-Mar self-contained units are listed for residential and cottage use by NSF, whose Standard #41 is the toughest composting performance standard in the world.

The 2" vent is attached at the top back of the Excel 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.

In normal use the Excel can normally evaporate all liquids, however 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.

The EXEL-NE (non-electric)
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.

By using a Sun-Mar composting toilet you are doing your environment a huge favor.

• You are protecting your lake and ground water from being polluted by pathogens and nutrients
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• You are saving huge amounts of water
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• You are recycling the nutrients directly back to the plants they came from.
No other way of handling human waste can compare with a Sun-Mar!

Protecting Your Lake or Ground Water
Toilet waste is over 90% water content. Sun-Mar evaporates this liquid and carries it back to the atmosphere via the vent system. Depending on the model, a Sun-Mar can evaporate up to 2 gallons per day. That’s a lot, when you consider there is no flushing water to bother with. By evaporating liquids, your Sun-Mar is ensuring that no pathogens or nutrients escape to pollute your lake, river, stream or groundwater. Zero output means zero pollution.

Recycling Nutrients

Waste is mostly made up of moisture, and complex organic molecules. These molecules contain plenty of carbon and hydrogen atoms. In a Sun-Mar, aerobic bacteria work to break these molecules down by converting the hydrogen to water and the carbon to carbon dioxide. Both are vented to atmosphere along with the moisture
The small amount of remaining materials are largely oxidized salts which are collected by a Sun-Mar in the finishing drawer.
This is a valuable resource which is ideally suited for uptake by plants, and constitutes less than 3% of the original volume of the waste.
By recycling in this way Sun-Mar returns the nutrients to the plants they came from.

Operating a Sun-Mar is easy. There are two things that you have to do on a routine basis - rotate the drum and add bulking material, at the rate of a cupful per person per day.

When it comes time to empty, you are never dealing with fresh waste; when the drum is 1/2 to 2/3 full, you rotate the drum backwards by releasing the drum locker and dump some compost into the finishing drawer. Leave it there to finish batch composting for 3-4 weeks.