If you poop, add a scoop. If you pee, let it be.
Months later, top-dress the brown spots in your lawn.
I interviewed David Myers of Build-Rite Construction LLC/Myers Barn Shop, and RN, a customer of his, about the Sun-Mar Composting Toilet. And the statements above are about the long and the short of it.
Myers is a Sun-Mar dealer, and has sold composting units in the region for the past 3 years. Due to their lack of impact on the environment– there is nothing to flush, no leachate to treat–the toilets can be installed anywhere, but they are still considered an oddity for local permitting departments because the National Building Code, requiring a conventional septic. However, per application the local counties are giving it some attention.
A year prior to finding Sun-Mar, RN had purchased and installed another brand of composting toilet that only meets the performance standard of the National Sanitation Foundation (Sun-Mar composting toilets are certified by the National Sanitation Foundation) but it proved to have odors and did not compost completely. So he went to a Mother Earth News show with his family and his young daughter spotted Myers’ Sun-Mar display. “Buy one!” his daughter urged him.
And since his small home did not provide room for the large composting toilet system, he chose the self-contained unit. Based on his bad experience with the other brand and looking at the show model at Myers’ office, he decided to buy a Sun-Mar unit. “We wanted something simple, that worked, with no environmental impact,” he says.
All Sun-Mar toilets are designed so that air is constantly being drawn in and up the vent stack providing odor-free operation; some have an electrical fan and heating element that dries out the compost material quickly; others use natural draft to do the job. The human waste (the nitrogen portion of the composting process) mixes with the Sun-Mar organic carbon bulk material — “it contains hemp straw and peat moss as well as other components, though people have tried to make up their own version it doesn’t work very well,” Myers says. Turn the drum regularly for six rotations, where the carbon and nitrogen stock that make up compost are mixed; only adding a scoop of the bulking mix at each bowel movement (add a scoop when you poop!) The carbon/nitrogen mix drops into a holding tray at the foot of the toilet, which is emptied 4-6 times per year in an average 4 person household.
“The smell is non-existent,” RN says.
Myers says he added Sun-Mar composting toilets to his offering of storage buildings, cabins, garages, and basement remodels because it is an affordable option when access to plumbing and electricity is difficult to access. We also have Sun-Mar units designed for the whole house where the toilet looks more like a traditional toilet with the composting taking place below the floor of the home. The units range from $1,500 – $3,000.