In 1971 Hardy Sundberg of Sun-Mar developed the world’s first self-contained composting toilet.

For the first time a self-contained toilet could be put in a bathroom and would evaporate liquids and compost solids.

The next big technical breakthrough came in 1979 when Hardy developed his third generation toilet which incorporated a rotating drum as the composting chamber. This was a three chamber design which used separate chambers for composting, evaporating, and compost finishing. Now the environment for each function could be optimized individually.

In keeping with the family tradition, a Sundberg still leads Sun-Mar’s research and development effort. Sun-Mar remains the world leader in composting toilets. Each model is designed to fill a specific need, and each is distinguished by innovative design, superior technology, and Sun-Mar’s legendary quality.

The way a Sun-Mar works is not only unique, it is also elegantly simple. Common sense tells us that the best way to compost is to use a drum. Luckily for Sun-Mar, our many international patents ensure that only Sun-Mar can take full advantage of the benefits a drum offers for mixing and aeration.


SAI Certification


All Sun-Mar Composting Toilet Systems are certified against the "AS/NZS 1546.2:2008 On-site domestic wastewater treatment units – Waterless composting toilets" standards.


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Sun-Mar Excel NE (Non Electric)

If you’re in a situation where you need to be off-the-grid and completely self-sufficient, then this is the Sun-Mar model you want to look at. The Excel NE model was first designed in 1981 and still today it remains the standard setting unit for completely non-electric composting toilets.
$3,200.00 incl tax excluding shipping

Sun-Mar Excel 240

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.
$3,650.00 incl tax excluding shipping

WCT Sun Mix Blue

This multimedia mix of organic carbon bulking materials is best suited for M/F (micro-flush) Sun-Mar systems
$30.00 incl tax excluding shipping

WCT Sun Mix Green

This multimedia mix of organic carbon bulking materials is best suited for all A/F (airflow) and Self-Contained Sun-Mar systems
$30.00 incl tax excluding shipping

Coco Peat 1 Brick

Bulking agent for composting system to improve performance 5kg 100% coco peat compressed brick.
$15.00 incl tax excluding shipping

Special Grade Wood Shavings - Recommended for Sun-Mar systems

The Sun-Mar performs the best with a 5-10mm (fine) wood shavings (special grade).
$30.00 incl tax excluding shipping

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