Products are only certified by NSF after an exhaustive 6 month test. Backed up by satisfactory experience in the field which requires, amongst many requirements, that there is no odour, even during overload testing, the compost produced has to contain extremely low levels of faecal coliform.
Only products certified and listed by NSF may bear the NSF mark, which is required by many regulatory bodies to prove that the composting toilet does indeed meet the NSF standard. Sun-Mar composting toilets are alone in being able to bear the NSF mark as being certified for cottage and residential use.
View the “NSF/ANSI STANDARD 41 Non-Liquid Saturated Treatment Systems” Listing Page here.
You can also view the NSF Fact Sheet here. (in PDF format)