Operating a Sun-Mar composting toilet 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 full, you rotate the Bio-Drum backwards by releasing the drum locker and dump some compost into the finishing drawer. Leave it there to finish batch composting for 4 weeks. If large lumps develop in the drum break them up with the rake to ensure good aeration. The following sections give more detail on use and maintenance. Please also see our installation section for more detail.