Want to install a composting toilet upstairs or in a basement? You can! The best solution for installation below/above the ground floor is a self-contained zero leachate system.
If you have a urine-collecting system in which urine is gathered in a container separate to the composting chamber, you will need to dispose of the urine manually once your container is full.
If you have a self-contained system that requires frequent emptying, it is WCTNZ recommended practice to set up a secondary treatment system in which the compost can mature prior to burial.